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    Do Electronic Cigarettes Increase Cigarette Smoking in UK Adolescents? Evidence from a 12-month Prospective Study

    Conner, M, Grogan, S, Simms-Ellis, R, Flett, K, Sykes-Muskett, B, Cowap, L, Lawton, R, Armitage, CJ, Meads, D, Torgerson, C, West, R and Siddiqi, K (2018) Do Electronic Cigarettes Increase Cigarette Smoking in UK Adolescents? Evidence from a 12-month Prospective Study. Tobacco Control, 27 (4). pp. 365-372. ISSN 0964-4563

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    Abstract

    Background: In cross-sectional surveys, increasing numbers of adolescents report using both electronic cigarettes (e-cigarettes) and cigarettes. This study assessed whether adolescent e-cigarette use was associated prospectively with initiation or escalation of cigarette use. Method: Data were from 2,836 adolescents (aged 13-14 years at baseline) in 20 schools in England. At baseline, breath carbon monoxide levels, self-reported e-cigarette and cigarette use, sex, age, friends and family smoking, beliefs about cigarette use, and percentage receiving free school meals (measure of socio-economic status) were assessed. At 12 month follow-up, self-reported cigarette use was assessed and validated by breath carbon monoxide levels. Results: At baseline, 34.2% of adolescents reported ever using e-cigarettes (16•0% used only e-cigarettes). Baseline ever use of e-cigarettes was strongly associated with subsequent initiation (N = 1,726; OR = 5•38, 95%CI = 4•02 to 7•22; controlling for covariates, OR = 4•06, 95%CI = 2•94 to 5•60) and escalation (N = 318; OR = 1•91, 95%CI = 1•14 to 3•21; controlling for covariates this effect became non-significant, OR = 1•39, 95%CI = 0•97 to 1•82) of cigarette use. Conclusions: This is the first study to report prospective relationships between ever use of e-cigarettes and initiation and escalation of cigarette use among UK adolescents. Ever use of e-cigarettes was robustly associated with initiation but more modestly related to escalation of cigarette use. Further research with longer follow-up in a broader age-range of adolescents is required.

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