E-cigarette transitions from Wave 1 (2013–2014) to Wave 2 (2014–2015) by cigarette smoking status and age*, PATH Study (n=2932)
| Product use state at Wave 1 | Product use state at Wave 2 | |||||||
| Dual use† | Exclusive e-cigarette use‡ | Exclusive established cigarette use§ | Neither e-cigarette nor established cigarette use¶ | |||||
| % | 95% CI | % | 95% CI | % | 95% CI | % | 95% CI | |
| Age category | ||||||||
| All adults 18+ | ||||||||
| Dual use (n=2036) | 44.3 | 41.7 to 47.0 | 5.1 | 4.0 to 6.6 | 43.5 | 40.9 to 46.2 | 7.0 | 5.9 to 8.3 |
| Exclusive e-cigarette use (n=896) | 13.5 | 11.3 to 16.3 | 43.4 | 40.0 to 46.8 | 12.2 | 10.0 to 14.9 | 30.9 | 27.5 to 34.5 |
| Former established cigarette Use (n=394) | 16.4 | 12.7 to 21.0 | 53.1 | 48.1 to 58.1 | 11.2 | 8.2 to 15.3 | 19.2 | 15.3 to 23.8 |
| Never established cigarette use (n=502)** | 10.7 | 7.9 to 14.5 | 34.2 | 29.5 to 39.2 | 13.2 | 10.4 to 16.6 | 41.9 | 37.0 to 47.0 |
| Young adults 18-24 | ||||||||
| Dual users (n=538) | 45.5 | 40.3 to 50.8 | 5.3 | 3.5 to 7.9 | 39.4 | 34.5 to 44.4 | 9.9 | 7.3 to 13.2 |
| Exclusive e-cigarette Use (n=341) | 13.1 | 9.0 to 17.1 | 37.1 | 31.5 to 43.0 | 11.2 | 7.8 to 16.0 | 38.6 | 32.9 to 44.5 |
| Former established cigarette use (n=68) | 23.5 | 14.6 to 35.5 | 27.1 | 17.5 to 39.5 | †† | †† | 29.7 | 19.2 to 42.8 |
| Never established cigarette use (n=273)** | 10.2 | 6.8 to 14.9 | 39.9 | 33.5 to 46.7 | 8.8 | 5.7 to 13.5 | 41.1 | 34.2 to 48.3 |
| Adults 25+ | ||||||||
| Dual use (n=1497) | 44.0 | 41.3 to 46.8 | 5.1 | 3.9 to 6.7 | 44.5 | 41.7 to 47.4 | 6.4 | 5.2 to 7.8 |
| Exclusive e-cigarette Use (n=554) | 13.2 | 10.4 to 16.6 | 46.0 | 41.9 to 50.2 | 12.7 | 9.9 to 16.0 | 28.1 | 23.9 to 32.8 |
| Former established cigarette use (n=326) | 15.4 | 11.6 to 20.2 | 56.9 | 51.4 to 62.2 | 10.0 | 7.0 to 14.2 | 17.7 | 13.6 to 22.6 |
| Never established cigarette use (n=228)** | 10.0 | 6.5 to 15.1 | 30.4 | 24.4 to 37.2 | 16.5 | 12.3 to 21.9 | 43.1 | 35.8 to 50.8 |
Frequencies are based on unweighted data and all other estimates are weighted.
*Among the 3642 current (every day or some day) users at Wave 1, 683 do not have follow-up information and 245 reported never having used an e-cigarette at Wave 2. For this analysis, the 683 who do not have follow-up information at Wave 2 are excluded from the Wave 2 totals shown above; the 245 who reported current e-cigarette use at Wave 1 but reported never use at Wave 2 are treated as former e-cigarette users. Respondents at Wave 1 were asked about their ‘e-cigarette’ use, whereas in W2 respondents were asked about their e-cigarette use as well as other ENPs including ‘e-cigars’, ‘e-pipes’ and ‘e-hookah’. The use states in the table above for Wave 2 reflect use of any ENP, including e-cigarettes.
†Those who reported current e-cigarette use (every day or some day) as well as current (every day or some day use) established (have smoked at least 100 cigarettes in their lives) cigarette use.
‡Those who reported current e-cigarette use (every day or some day) but not current established cigarette use (either not smoking every day or some days OR not having smoked at least 100 cigarettes in their lives).
§Those who reported current (every day or some day use) established (having smoked at least 100 cigarettes in their lives) cigarette use and reported currently not using e-cigarettes.
¶Those who reported not currently using e-cigarettes and not being current established cigarette smokers.
**Never established cigarette users includes those who may have reported cigarette smoking in W1, but reported not having smoked 100 in their lifetime. Overall, this includes 52 never smokers (not even a puff) and 455 who reported ever smoking but did not meet the 100 threshold. By age, among young adults 43 reported never smoking and 231 who reported ever cigarette use but had not met the threshold and among adults, 9 reported never smoking and 223 who reported ever cigarette use but had not met the threshold.
††Relative SE >30%.
ENPs, electronic nicotine products; PATH, Population Assessment of Tobacco and Health.