1. Electronic cigarette companies cannot inform consumers that these products are safer than cigarettes, and they cannot even tell the public that they are free of tobacco.

While the attacks were mostly personal, and not worthy of expounding here, the shred of substance was that more recent studies which compared lung cancer risks of successive cohorts of smokers have found increased risk among more recent cohorts. From these studies, the Surgeon General's report - and these co-authors - conclude that filters must convey an increased risk of cancer.

(See: Zhu S-H, et al. Four hundred sixty brands of e-cigarettes and counting: implications for product regulation. Tobacco Control. Published online ahead of print on June 17, 2014.)

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