Observational study finds e-cigarette users are more likely to start smoking tobacco in adolescence, suggesting potential health risks.
Among high school students in Los Angeles, those who had ever used e-cigarettes at baseline compared with nonusers were more likely to report initiation of combustible tobacco use over the next year. Further research is needed to understand whether this association may be causal.
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Leventhal et al. (2015) studied this question.
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