Dutra and Glantz1 reported that, in US school students, those who used e-cigarettes were also likely to be smoking conventional (combustible) cigarettes. Despite the associational, rather than causal, nature of the study design, the authors concluded that “Use of e-cigarettes does not discourage, and may encourage, conventional cigarette use among US adolescents” and “e-cigarette use is aggravating rather than ameliorating the tobacco epidemic among youths.”
Niaura RS, Glynn TJ, Abrams DB. Youth Experimentation With e-Cigarettes: Another Interpretation of the Data. JAMA. 2014;312(6):641–642. doi:10.1001/jama.2014.6894
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