A further limitation of the existing literature is that most population-based studies have classified cigarette smoking and e-cigarette use crudely, often treating e-cigarette use as a binary variable without distinguishing between exclusive e-cigarette users, dual users, and former smokers who no longer use any nicotine product
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Listen, I have so many great rock & roll memories of great, awesome kindness
doi:10.1016/S1473-3099(12)70257-8