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    Association between age at first reported e-cigarette use and subsequent regular e-cigarette, ever cigarette and regular cigarette use

    Conner, Mark, Grogan, Sarah ORCID logoORCID: https://orcid.org/0000-0002-7510-765X, Simms-Ellis, Ruth, Cowap, Lisa, Armitage, Christopher J, West, Robert, Marshall, Anne-Marie and Siddiqi, Kamran (2021) Association between age at first reported e-cigarette use and subsequent regular e-cigarette, ever cigarette and regular cigarette use. Addiction, 116 (7). pp. 1839-1847. ISSN 0965-2140

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    Background and Aims: Association of electronic cigarette use and subsequent smoking has received considerable attention, although age of first use has not. This study tested differences in regular (e-cigarettes, cigarettes) and ever (cigarettes) use between e-cigarette user groups: early versus never users, late versus never users, early versus late users and effects of controlling for covariates. Design: Prospective study with 12- and 24-month follow-up of e-cigarette/cigarette ever/regular use with data from an intervention. Setting: Forty-five schools in England (Staffordshire and Yorkshire). Participants: Never smokers (3289 13-14 year olds) who were part of a cluster randomised controlled trial. Measurements: Sample divided into groups of e-cigarette users: early users (at 13-14 years), late users (at 14-15 years), never users (at 13-14 and 14-15 years). Dependent variables were self-reported regular e-cigarette and cigarette use, ever cigarette use at 15-16 years. Covariates were assessed. Findings: Early users and late users compared with never users were significantly more likely to be regular e-cigarette users (early: OR=9.42, 95%CI=5.38, 16.49, p<.001; late: OR=6.89, 95%CI=4.11, 11.54, p<.001), ever cigarette users (early: OR=7.96, 95%CI=6.02, 10.53, p<.001; late: OR=5.13, 95%CI=3.85, 6.84, p<.001), and regular cigarette users (early: OR=7.80, 95%CI=3.99, 15.27, p<.001; late: OR=4.34, 95%CI=1.93, 9.77, p<.001) at age 15-16 years. Late users compared with early users had significantly lower rates of ever use of cigarettes at 15-16 years (OR=0.48, 95%CI=0.35, 0.66, p<.001), although this difference was non-significant at 12 months after first use of e-cigarettes (OR=0.89, 95%CI 0.64, 1.25, p = .498). Controlling for covariates did not change findings. Conclusions: Adolescents in England who report using e-cigarettes at 13-14 years of age have higher rates of subsequently initiating cigarette use than adolescents who report using e-cigarettes at 14-15 years, a difference that may be attributable to a longer period of time to initiate cigarette use in former group.

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