Article Text
Abstract
This paper builds on tobacco document research by analysing contemporary materials to explore how the global tobacco market has changed, how transnational tobacco companies (TTCs) are responding and the implications for tobacco control. The methods involved analysis of a variety of materials, including tobacco company annual reports, investor relations materials, financial analyst reports, market research reports and data. Once China, where TTCs have little market share, is excluded, global cigarette volumes are already declining. Nevertheless, industry profits continue to increase. This pattern is explained by the pricing power of TTCs—their ability to increase prices faster than volumes fall, a consequence of market failure. Pricing power is now fundamental to the long term future of TTCs. Consequently, and in light of growing regulations, the business model of the TTCs is changing. Product innovation is now a key marketing technique used to drive consumers to buy more expensive (ie, profitable) premium cigarettes. Contrary to established wisdom, high tobacco excise rates, particularly where increases in excise are gradual, can benefit TTCs by enabling price (profit) increases to be disguised. Large intermittent tax increases likely have a greater public health benefit. TTC investments in smokeless tobacco appear designed to eliminate competition between smokeless tobacco and cigarettes, thereby increasing the pricing power of TTCs while enabling them to harness the rhetoric of harm reduction. Monitoring TTCs can inform effective policy development. The value maximising approach of TTCs suggests that a ban on product innovation and more informed tobacco excise policies are needed.
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Introduction
Tobacco document research has produced an important body of literature which has proved essential in holding the industry to account and informing policy development.1 This paper aims to build on such research by using more contemporary materials to explore how the global tobacco market has changed in the past 20 years, how transnational tobacco companies (TTCs) are responding and what the implications are for global tobacco control.
These contemporary materials (including company annual reports, investor relations' materials, press coverage, financial analyst and market research reports) provide a means of monitoring tobacco industry activity, as enshrined in Article 5.3 of the Framework Convention on Tobacco Control which requires signatories to protect health policies ‘from commercial and other vested interests of the tobacco industry’.2 These materials are also available on most companies registered in the west and thus the approach used could be expanded to research other industries (eg, alcohol and food companies). Finally, they provide a more timely analysis of industry activity than is possible through analysis of tobacco documents alone (the most recent of which date to the early 2000s).
Methods
In addition to existing academic literature, the paper draws on the analysis of a variety of materials examined from 2007 onwards (although some date from before that) as part of efforts by the University of Bath Tobacco Control Research Group to monitor the business and marketing activities of TTCs. These include company annual reports, investor relations materials and press releases, financial analyst reports (those of Citigroup, Morgan Stanley and Redburn), press coverage and market research reports, and other data (predominantly Euromonitor, although Keynote, Mintel and ERC reports also informed the work). Tobacco industry journals—Tobacco Journal International and Tobacco Reporter (which cover the global tobacco market)—and the retail magazine, The Grocer (which covers just the UK) were also examined.
The paper uses these materials to examine current global tobacco market dynamics, focusing first on cigarettes and then on smokeless tobacco (ST), and within each of these areas, how TTCs are responding. The latter analysis focuses on British American Tobacco (BAT), the world's second largest TTC. This focus is driven by pragmatism: it would be impossible to examine all TTCs in detail within a single paper although examples from other TTCs are provided to illustrate similarities and differences.
Results
The global tobacco market—cigarettes
Cigarette volume trends
In 2010, an estimated 92% of revenue in the global tobacco market was generated from cigarettes,3 making this the most important sector for TTCs.4 Between 1960 and 2000, global cigarette consumption increased by 4% per annum5 6 (figure 1), but since 2000, growth has slowed to under 1% annually,7–11 and from 2015, volume declines are predicted.12 Once China is excluded, global volumes are already falling.7 8 12
This growth slump reflects both improvements in tobacco control and the saturation of opportunities following the industry's successful global expansion and consolidation over recent decades.13–18 Most state owned tobacco companies have now been privatised16 or the markets opened to TTCs through other means.15 19 The world's largest market, China, looks closed to the TTCs: tobacco is apparently excluded from China's World Trade Organisation accession agreement (despite the best efforts of TTCs)20 and the licensing agreements reached to date remain insignificant.21
Cigarette value trends and pricing power
The industry's main interest, however, is profits, and despite stagnating sales, profits continue to rise (figure 2). Indeed, perhaps the most remarkable change in the tobacco industry in recent years is the increase in its pricing power: its ability to ensure that prices (and thus profits) increase more quickly than volumes fall.22 As explained elsewhere,22 this pricing power occurs in large part because tobacco is an addictive product with few substitutes and because there is very limited competition in the global tobacco market (just four TTCs—Philip Morris International (PMI), BAT, Japan Tobacco International (JTI) and Imperial Tobacco Group17—dominate the global market outside China). This enables the companies to increase prices almost at will, making the manufacture of tobacco products uncommonly profitable and ensuring that profits rise even when volumes fall.22
Consequently, the value of global cigarette sales has risen by 84% in the past decade despite limited volume growth, with marked increases in value seen even in markets experiencing major volume declines (figure 2).
Combining volume and value maximising approaches
In limited numbers of markets opportunities for volume growth remain, and while this is the case the industry will combine its long term (volume) and short term (value) profit maximising approaches. The latter model predominates in established markets with the profits generated used to subsidise the volume maximising approach typical of emerging markets. (As explored later, although one model may predominate, a combined approach is also taken within individual markets to allow for the differing price sensitivities of smokers.)
Volume maximisation (emerging markets)
There are three main ways that TTCs can gain volume: entering new markets, acquiring new businesses and pushing up consumption. All are more limited than in the past, particularly the first two, and consequently the current focus is on pushing consumption. Three years ago the priority markets with scope for expanding consumption included Eastern Europe.23 With volumes there now declining, the focus has shifted to Asia, Africa and the Middle East3 24 where consumption growth will occur through income and population growth alone,8 12 the latter sufficient to increase sales even if smoking prevalence falls.24 Further opportunities emerge from shifting smokers of traditional products such as beedis (small, hand rolled cigarettes traditionally used in South Asia) onto white stick cigarettes, and pushing women, who traditionally have lower rates of smoking, to take up the habit. If the former strategy fails, TTCs can move into the beedi market, as occurred with kreteks (traditional clove cigarettes) in Indonesia.25 26 It is for these reasons, and because of their sheer size (Asia accounted for 60% of world cigarette sales in 2010, Euromonitor data downloaded 6 September 2011), that the markets in Asia are key. India, the world's second most populous country, is an excellent example: beedis account for 85% of total tobacco consumption and female smoking remains low at 4.4% compared with 24% in men.24 27 Consequently, marketing to women, young people and beedi smokers, assisted by women's empowerment, income and population growth, will provide enormous opportunities.
Evidence from the industry's exploitation of the former Soviet Union in the early 1990s illustrates the aggressive approach of TTCs to volume expansion in emerging markets. TTCs competed aggressively to acquire market share. They lobbied to keep tobacco excise low, sold cigarettes cheaply (including via illicit trade) and marketed heavily, ignoring existing legislation and specifically targeting women.28–33 In Russia, smoking rates increased, markedly so in women, the age of first smoking fell and consumption spiralled.30 34
Yet BAT indicates that profits did not start accruing in Russia until 2000,35 36 referring to the approach in the 1990s as ‘share at all costs market dynamics’.35 Assisted by economic and income growth, BAT began to switch from this ‘high volume, low value’ approach35 to a value maximising approach.10 35 36 The impact this can have on profits is illustrated by BAT's estimation in 2006 that simply shifting sales of 1 billion sticks (by my estimate just 1% of BAT's Russian market share at that time) from a low priced brand to a premium priced brand would provide an additional £20 million in revenue.37 Consequently, Russia, similar to Ukraine38 and most of the Eastern European region it dominates, has in the past few years shifted from being a volume to a value growth market (as figure 2 illustrates, this region shows the most marked value growth in recent years). This suggests the initial aim was to rapidly increase volumes regardless of profits; once volumes were large enough and the regional economies strong enough, prices were increased, the overall plan ensuring long term profits. This model will inevitably be repeated in Asia, the timing of the switch from a volume to a value maximising strategy dependant on economic and regulatory developments. Philip Morris documents and its conduct in Thailand suggest it takes a similar approach.39 40
Value maximisation (established markets): marketing to ensure ‘willingness to pay a premium’41
Global cigarette volume predictions (see above) indicate that the long term future of TTCs is now largely dependent on pushing value rather than volume.3 42 Consequently, and due to growing regulations, marketing and pricing strategies are changing. Increasing restrictions on marketing have increased the importance of retail outlets as a focal point for marketing. Hence developing promotions that work in this forum and building relationships with retailers are now key.41 43 More broadly, while the five Ps (product, price, place, person and promotion) remain central, there are nuanced changes in the mix 37 43:
Right product, right price
To improve marketing efficiency BAT has, for almost 15 years now, been narrowing its previously massive brand portfolio to focus on four ‘global drive brands’—Lucky Strike, Dunhill, Kent (premium brands) and Pall Mall (economy brand).37 44 More recently, two others, including Vogue (specifically targeted at women), were added.10 23 These brands have shown remarkable growth,10 41 outstripping growth in competitors' main brands.11 37 This emphasis on premium brands, shared by other TTCs, has led to premium brands gradually making up a greater share of the global market24 (albeit not all individual markets, as explored below). Owing to the considerably greater profitability of premium brands,37 this approach maximises profits.44
Innovation
Innovation is key to driving sales of these premium brands, and thus profits, by ensuring ‘willingness to pay a premium’.11 23 41 45 Innovation covers both packaging (eg, resealable packs) and product innovations (eg, capsule technology, aromas, new filter technology and superslim products targeted at women)11 23 37 44 46; the latter increasingly central to the marketing efforts of BAT42 47 48 and other TTCs in the past 5 years46 49 50 (see figure 3). In 2010, BAT claimed that over 10% of sales came from product innovation, of which almost half were new products and variants that did not exist a year previously.52 While obviously central to BAT's current marketing strategy, more interesting is the importance of innovation to BAT's business model,41–43 being described by BAT's new chief executive as ‘fundamental to BAT's value growth’.42
A key concern is that these innovations, particularly those focusing on filter design (which have no documented potential in reducing risk), may convey a misleading suggestion of reduced risk akin to the ‘light’ cigarette debacle.53 Indeed, according to Euromonitor, innovation has three purposes—‘to justify a premium price, to promise a different experience and to suggest a reduced risk experience’ (emphasis added) (Chart 2924).
Right person
As before,54 young people remain key to the industry, with the global drive brands all targeted at this age group.44 The reason, it appears, is that the young are prepared to pay more for brand value and innovation, whether in the form of lights, menthols, charcoal filters or global drive brands generally. One BAT marketing presentation refers to the need to ‘WIN THE ASU30 (adult smoker under 30) CONSUMER’,10 while another labels young smokers as the ‘drivers’ of shareholder value.37 It outlines how these are the smokers likely to switch brand and to pay for expensive brands/brand value; although only 21% of volume, they account for 30% of switching volume and 42% of switching margin whereas older smokers are both less likely to switch and more likely to trade down than up if they do so.37
Price and excise policy
Contrary to established wisdom, it appears that the industry's pricing power is, in many countries, facilitated by tobacco excise policies20 23: when tobacco excise rates are high, manufacturer's profits represent only a small share of the retail price and increases in these profits, because they make relatively little contribution to the overall price rise, can be disguised as part of the tax increases. In the words of Morgan Stanley, ‘high taxes ….can be good for profits’.8 A good example is the UK which, despite having some of the highest taxes in Europe, is one of the region's most profitable markets.17 Evidence from Ukraine even suggests that cigarette excise increases can prompt the industry to shift from a volume to a value maximising approach.37
Emerging evidence from financial analyst reports,8 21 industry documents55 and research on industry lobbying56 also suggests that regular, moderate tax increases can benefit industry while large intermittent tax increases have a greater impact on demand. Analysts, for example, note that ‘steady, small tax increases can be helpful for the industry’21 while ‘large unforeseen increases are one of the most effective means of reducing smoking prevalence’.8 As BAT noted back in 1992:The psychology of smoker demand is such that they are more likely to absorb smaller and more frequent price increases than larger and less frequent price increases. During negotiations with government therefore it is preferable to seek the former excise environment.57
Value maximisation: making efficiency savings
Increasing efficiency—for example, by integrating the supply chain, closing factories and streamlining the brand portfolio58 59—is also key to profit maximisation and has helped BAT address its historical inefficiencies.8 21 23 41 58 60–63 Between 2003 and 2007, BAT closed 25 factories, reducing the number of countries it manufactures in from 61 to 40, saving over £1bn.23 41
The hidden agenda: cheap tobacco products
Although TTC presentations to analysts barely mention the value end of the market,64 65 in mature markets, despite the heavy marketing of premium brands, use of cheap tobacco products is growing48 66–69 as is the use of price within the marketing mix.70–72 In the UK, for example, TTCs have launched a number of ‘ultra low price’ variants of existing cigarette brands since 2006 (28 brands including 85 sub-brands are now available in this price segment).73–75 These cheap products appear to stop price sensitive smokers from quitting (key during a recession46) and are also likely to provide a route into smoking given the price sensitivity of the young.67 This implies that, just as the industry's global approach combines short and long term profit maximising approaches across markets, the same combination is applied within individual markets: at the top end, TTCs increase prices over and above the tax increases (ie, overshift the taxes thus increasing profits), while using these profits to enable them to absorb tax increases (rather than pass them on in full to the consumer) on the cheap brands.67
Innovation is also important in this value segment50 where various forms of make your own cigarettes have been launched in an apparent attempt to undermine tax policy.76 77 For example, ‘singles’ (pre-made cylinders of tobacco) were taxed as loose tobacco rather than (the more heavily taxed) ready made cigarettes when launched in Germany until this practice was overruled.78 In the UK, Imperial Tobacco launched a new make your own product immediately following the 2011 annual increase in cigarette duties.76 77
The global tobacco market—smokeless tobacco
While previous decades were characterised by frequent mergers and acquisitions in the cigarette sector,17 the past few years have seen a switch in emphasis to ST and, very recently, nicotine,79 80 as explored elsewhere in this edition.18 All four TTCs have now acquired significant ST interests or established joint ventures with ST manufacturers to the extent that no major ST companies now remain independent.81
ST sales have been growing more rapidly than cigarettes (a 51% increase in global volumes compared with 8% in cigarettes from 2001 to 2010) and are predicted to continue increasing.1 47 This is, however, occurring from a far lower base, and in 2010 just 2% of revenue from the global tobacco market was generated by ST.3
Rhetoric of ‘responsibility’ and harm reduction
Corporate social responsibility
‘Responsibility’ is one of three main elements in BAT's business strategy,43 82 suggesting it is essential to BAT's future. Responsibility features heavily in its public messaging7 10 82 83 yet what appears under the rubric of responsibility is telling: harm reduction, reputation management, ‘sensible regulation’, standards of business conduct and business principles.10 82 ‘Sensible regulation’ is described as ‘proactively shaping an environment to succeed’ with reference made to building trust and gaining stakeholders for dialogue, the aim apparently to move ‘from dialogue to evolving cooperation’.7 10 A BAT presentation on Russia implies that responsibility means being the ‘government's trusted partner’.83 These presentations thereby make explicit that BAT's corporate social responsibility (CSR) strategy has little to do with responsibility and is instead a political strategy aiming to ensure access and influence.84 85
Harm reduction
While harm reduction features as part of BAT's responsibility strategy, unlike other aspects of this strategy, details are rarely fleshed out10 23 and, despite its recent investments in ST, ST is virtually absent from BAT's business plan. This suggests that BAT has little intention of pushing ST in the short term (outside markets such as the USA where ST use is already well established). Indeed, BAT recently scaled back its snus test markets86 suggesting that snus may not take off in countries where ST use is not already well established. Similarly, PMI's chief financial officer, when speaking about its joint venture with snus manufacturer Swedish Match, suggested PMI had little intention of pushing ST in the short term given the profitability of cigarettes:It's something that will do us very good in the long term. This is why we went into this joint venture. ……The big profitability pools in the international tobacco world, often are, and continue to be, in the cigarette category. But you always need to be one step ahead, which is why we went into this joint venture.87
Nevertheless, BAT's rhetoric on harm reduction is ever present, featuring prominently on the company's main website, an additional website dedicated to BAT's research on reduced risk products (http://www.bat-science.com) in responses to consultations and press briefings.88 89 Furthermore, BAT's latest presentation on harm reduction suggests its motives may be more underhand, with success in harm reduction predicted to include ‘[m]ore marketing freedoms and enhanced brand equity enabled by regulatory and political support' and ‘[n]ew “would be smokers” begin with and stay with low risk product categories'.90 The last point echoes BAT's documents from the 1970s and 1980s which identified that ST provided an opportunity to encourage those who would no longer take up smoking (due to health concerns) to take up ST instead; that is, to create a new epidemic.91
Discussion
Key findings
This paper shows that the global cigarette market has changed in key ways. First, once China is excluded from the figures, global consumption is falling and the opportunities are increasingly about driving value rather than volume. Second, the industry is able to increase profits in the face of declining sales due to its phenomenal pricing power which is now fundamental to its future. Volumes are, however, still growing in some countries and consequently the industry is pursuing two models of growth: a traditional volume maximising model where volumes are pushed at almost any cost and a profit maximising model that drives prices upwards (facilitated by high tobacco excise duties) and pushes consumers to smoke expensive brands using product innovation as a marketing strategy. The first model predominates in emerging markets and the second in established markets, although most inevitably include a mix of these models with the profits generated in the second used to subsidise the first. Third, TTCs, which were until recently effectively cigarette companies, have become tobacco and nicotine companies having invested so significantly in the ST market that there are now no large independent ST companies left. This appears to have been a defensive move designed to eliminate competition between ST and cigarettes, enhance pricing power and provide a sector with volume growth (reassuring investors) and long term security should regulation finally start to threaten profitability from cigarettes.
Implications for policy and practice
Many of the issues outlined above can be addressed through full implementation and enforcement of the Framework Convention on Tobacco Control. This section therefore focuses on specific elements within that, or more novel options.
Emerging markets
In emerging markets there is still potential to constrain the size of the tobacco epidemic and, through this, the industry's long term future. Preventing marketing (including the launch of new brands targeted at women) and the industry's ability to sell tobacco cheaply are vital. Morgan Stanley notes that ‘anti-smoking legislation specifically aimed at women in emerging markets could provide the greatest single impediment to industry growth'.8 Targeting resources at the fastest growing markets in volume terms (Asia, Africa and the Middle East) will help, but so too will reducing tobacco use in the most profitable markets, thereby reducing funds available to subsidise expansion elsewhere.
All markets
Interventions that challenge the industry's ability to grow value are now the industry's greatest threat.11 21 There are a number of regulatory options that the evidence above suggests should be considered.
Further marketing controls
Product innovation is a particular concern given that it may be used to convey a misleading message of reduced risk, just as light cigarettes did in the past and, in the value segment, to undermine the impact of tax increases, and because young people remain a marketing target. The tobacco market should be frozen as it is currently and no new products or brand variants introduced unless they can show significant health benefits. Given that BAT has been working on a reduced risk cigarette for decades yet still not produced one, this scenario is unlikely. Such regulation would close the industry's main marketing tactic in countries where tobacco advertising is otherwise restricted. Uruguay has legislation that resembles this—it requires that each tobacco brand may only possess a single form of presentation.92
The public health community should recognise and work with retailers as an important means of communicating with smokers, just as industry does. There is a need to understand the retail margin on tobacco versus other products (including quit products), and to explore how this might be used to encourage retailers to disseminate quit messages and products.
A more informed excise policy
We must recognise that (in high tax markets at least) the industry is not opposed to price increases per se but wants this to occur via its own price increases and not via tax increases. Evidence shows it has used the threat of increased smuggling to contain tax increases and instead, in direct contradiction to its lobbying stance, increased prices itself,93 thus ensuring that its profits and not government revenues increase. While high prices are good for public health, the industry's ability to do this represents a missed opportunity for governments to raise taxes and revenue. Empirical research is needed to explore the impact of large intermittent versus small gradual tax increases. Such work should examine impacts on consumption, prevalence, inequalities in smoking and government revenue. In the interim, further consideration should be given to implementing large rather than small gradual tax increases.
Price cap regulation
Price cap regulation could address many of the problems identified in this paper.22 The proposal for price cap regulation emerged from concerns about the extent of market failure and the resulting excess TTC profits. Under such a system, well established in the utilities sector, industry profits would be capped and the excess profits transferred to the government as additional excise revenue while maintaining high tobacco prices for consumers. This would produce significant additional government revenue94 and, by reducing industry profit, remove the TTCs' incentive and ability to oppose tobacco control policies and offset losses in emerging markets through the excess profits generated elsewhere.22 It could thereby curtail the ultimate size of the global tobacco epidemic.
Price cap regulation would also remove the industry's ability to use price as a marketing tool, provide a means of controlling cigarette smuggling (because the industry could only profit from legal sales) and prevent underhand marketing by limiting or eliminating the marketing budget.22
Addressing corporate social responsibility
The paper provides further evidence that CSR must be recognised as a political activity84 85 by indicating that BAT's ongoing focus on CSR is essential to its ability to maintain sufficient credibility to participate in policy debates. The tobacco control community must therefore continue its efforts to expose TTC tactics as a counterbalance to this investment in CSR.95
Harm reduction
While evidence suggests that ST could be part of an effective harm reduction strategy,96 97 this paper highlights the need to understand the industry dimension. It suggests there are three major implications of recent TTC investments in ST and nicotine. First, TTCs now control the market for most cigarette substitutes, further restricting competition in the tobacco sector and enhancing pricing power of TTCs. Second, in contrast with cigarettes, ST and nicotine offer potential long term volume growth and thus reassurance to investors who, experts suggest, will ultimately become nervous about investing in a sector without volume growth.98 Third, these investments allow TTCs to harness the rhetoric of harm reduction, which has potential to secure access and influence, despite appearing to have little genuine intention of pushing ST products in the short term and the limited uptake of snus in markets where ST is not already established. As such, TTCs have turned ST from a threat (a product that could have competed with cigarettes) to an opportunity. Ensuring ST is adequately regulated and that conflicts of interest are addressed if and when TTCs launch a pure nicotine product will be essential to controlling the tobacco epidemic long term.
Efficiency savings and implications for impact assessments
Requirements to cost the impacts of regulation on business, via business impact assessments, are growing. While properly conducted impact assessments can be a vital part of effective policy making and have been widely used in environmental and public health, it is noteworthy that BAT, working with a broad group of other industries, specifically promoted the use of business impact assessments which use a cost benefit analysis approach because it felt they could help prevent the passage of public health policies and legislation.99 100 Evidence presented above on the extent of recent efficiency savings combined with evidence that further efficiency savings are predicted,23 58 underlines the importance of accounting for such savings when assessing policy impacts (eg, by accounting for underlying trends in factory numbers and employment levels). This is reinforced by evidence of the industry's willingness to exaggerate the costs of regulation100–102 and misrepresent planned factory closures59 as a direct cost of regulation.103 Furthermore, any costs must be put in the context of the industry's significant profits although attempts to do this102 have inevitably met with industry opposition.104
Limitations
The paper has focused on BAT. While the global market context is identical for all TTCs, there may be differences in the nature of each company's response. For example, Imperial Tobacco relies more on cheaper brands than BAT, has invested less in research and is less able to innovate; these issues could threaten its long term profitability compared with other TTCs.50 85 It, like PMI, also appears to have less scope for efficiency savings than BAT.105 The evidence presented will not necessarily apply to companies operating within specific markets, such as the USA. The issue of harm reduction is, for example, quite different there as ST use is already well established. Finally, it has been impossible to address all of the current complexities in tobacco control policy making that emerge through industry manipulation. A key omission is cigarette smuggling which will be addressed in a separate paper.
Conclusion
This paper highlights the complex tensions between volume and value, cigarettes and ST, harm reduction and CSR, and how an understanding of the motives and tactics of TTCs can inform policies, avoid pitfalls in policy development and ensure prompt policy responses to emerging issues. The public health community, by actively shaping the regulatory environment, has the potential to shape the future of the cigarette and ST epidemics.
What this paper adds
Much has been learnt from tobacco industry document research and it has proved essential to holding the tobacco industry to account.
This paper illustrates the way in which more contemporary industry materials can be used to monitor and analyse both the global tobacco market and current tobacco industry actions and how this information can be used to inform public health policy development.
It shows inter alia that:
Once China is excluded, global cigarette volumes are already declining but that, despite this, industry profits continue to increase.
This pattern is explained by the industry's pricing power—its ability to increase prices faster than volumes fall. This pricing power is a consequence of market failure and is now fundamental to the industry's long term future which is now largely reliant on value not volume growth.
Understanding this profit and value dimension is essential to understanding industry conduct and planning effective tobacco control interventions.
References
Footnotes
Funding This work is supported by grant No R01CA160695 from the United States National Cancer Institute. The ongoing industry monitoring that informs this paper is supported by funding from Cancer Research UK (grant No C27260/A12294) (http://www.cancerresearchuk.org) and Smokefree South West. ABG is supported by a Health Foundation Clinician Scientist Fellowship and is a member of the UK Centre for Tobacco Control Studies (UKCTCS), a UK Centre for Public Health Excellence which is supported by funding from the British Heart Foundation, Cancer Research UK, the Economic and Social Research Council, the Medical Research Council and the National Institute of Health Research, under the auspices of the UK Clinical Research Collaboration. The funders played no role in the study design, analysis and interpretation of the data, or writing of the report, or the decision to submit the article for publication. The content is solely the responsibility of the author and does not necessarily represent the official views of the funders.
Competing interests None.
Provenance and peer review Commissioned; externally peer reviewed.