Overview of participants’ use of IQOS, combustible cigarettes and e-cigarettes (n=30)
| Ex-IQOS use (n=8) | Current IQOS use (n=22) | Total (n=30) | |
| First tried IQOS | |||
| 1–3 months ago | 0 | 3 | 3 |
| 4–6 months ago | 0 | 3 | 3 |
| 7–12 months ago | 3 | 8 | 11 |
| More than 12 months ago | 5 | 8 | 13 |
| Length of IQOS use | |||
| 1–3 months | 1 | 3 | 4 |
| 4–6 months | 3 | 4 | 7 |
| 7–12 months | 1 | 10 | 11 |
| More than 12 months | 3 | 5 | 8 |
| Country/region first tried IQOS | |||
| UK | 6 | 15 | 21 |
| Continental Europe* | 2 | 5 | 7 |
| Japan | 0 | 1 | 1 |
| South Africa | 1 | 0 | 1 |
| Cigarette smoking status | |||
| Daily | 4 | 3 | 7 |
| Weekly | 0 | 4 | 4 |
| Monthly | 1 | 3 | 4 |
| Less than monthly | 1 | 5 | 6 |
| Not at all | 2 | 7 | 9 |
| E-cigarette use status | |||
| Daily | 1 | 1 | 2 |
| Weekly | 0 | 0 | 0 |
| Monthly | 1 | 0 | 1 |
| Less than monthly | 0 | 1 | 1 |
| Ex-e-cigarette use† | 5 | 19 | 24 |
| Never e-cigarette use‡ | 1 | 1 | 2 |
| Time using tobacco and nicotine products (years) | |||
| 1–5 | 4 | 5 | 9 |
| 6–10 | 0 | 5 | 5 |
| 11–20 | 2 | 1 | 3 |
| More than 20 | 1 | 11 | 12 |
| Total range (years) | 1–22 | 2–40 | 1–40 |
| Median (years) | 14 | 17 | 14 |
| Mean (years) | 9.7 | 17.7 | 15.7 |
*These included Bulgaria, Italy, Lithuania, Switzerland and Ukraine.
†As defined by answering “How often do you currently use e-cigarettes?” as “Not at all” and answering “Have you ever previously used e-cigarettes?” as “Yes”.
‡As defined by answering “Have you ever previously used e-cigarettes?” as “No”.
§This includes use of other tobacco and nicotine products during this period (eg, shisha and cigars). One participant did not disclose this information in a specific enough way, so exists as missing data. N.B. This also excludes large periods of time (over 1 year) in which successful quit attempts were made (ie, these years were removed from the total time spent using tobacco/nicotine products).