Footnotes

• Contributors FTF had the initial idea. NT and FTF conducted the search for relevant content and prepared the first draft. All authors reviewed and edited the draft.

• Funding LL acknowledges the support of Bloomberg Philanthropies’ Stopping Tobacco OrganizationsOrganisations and Products funding (www.bloomberg.org). The opinions expressed are those of the authors’ alone. The funders had no role in the analysis, decision to publish, preparation or review of the manuscript. The content is solely the responsibility of the authors and does not necessarily represent the views of the funders.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.