Similarly, the study found that 2.9% of the baseline nonsmokers had ever tried an electronic cigarette in the past year. It could have been that the respondent took a single puff on an electronic cigarette and never took another puff.

The letter picks up on many of the precise points that I have been arguing during the past few weeks: ; ; .

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.

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