Abstract
Background
Although electronic cigarettes (e-cigarettes) may help some smokers quit, some young
adult never-smokers are now using e-cigarettes recreationally, potentially increasing
their risk for initiation of smoking. We aimed to determine the association between
baseline e-cigarette use and subsequent initiation of cigarette smoking among initially
never-smoking young adults.
Methods
We conducted a prospective cohort study with assessments at baseline (March 2013)
and follow-up (October 2014). We used sampling frames representing 97% of the US population
to recruit a nationally representative sample of never-smoking young adults aged 18
to 30 years. The independent variable was baseline ever use of e-cigarettes. The main
outcome measure was initiation of traditional cigarette smoking between baseline and
18-month follow-up.
Results
Baseline surveys were completed by 1506 never-smoking young adults, of whom 915 (60.8%)
completed follow-up. There were no demographic differences between responders and
nonresponders. After applying survey weights—which accounted for both nonresponse
and overcoverage or undercoverage—2.5% of the represented population of never-smokers
(801,010 of 32,040,393) used e-cigarettes at baseline. Cigarette smoking was initiated
by 47.7% of e-cigarette users and 10.2% of nonusers (P = .001). In fully adjusted multivariable models, e-cigarette use at baseline was
independently associated with initiation of smoking at 18 months (adjusted odds ratio, 6.8;
95% confidence interval, 1.7-28.3). Results remained similar in magnitude and statistically
significant in all sensitivity analyses.
Conclusions
Baseline e-cigarette use was independently associated with initiation of traditional
cigarette smoking at 18 months. This finding supports policy and educational interventions
designed to decrease use of e-cigarettes among nonsmokers.
Keywords
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Article Info
Publication History
Published online: December 10, 2017
Footnotes
Funding: National Cancer Institute ( R01-CA140150 ).
Conflicts of Interest: None.
Authorship: All authors had access to the data and played a role in writing this manuscript.
Identification
Copyright
© 2018 Published by Elsevier Inc.