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 above argument is convenient for advocates who want to suppress "negative" or "unfavorable" findings by discouraging RCTs - which they believe will "underestimate" the effectiveness of e-cigarettes for smoking cessation and encouraging survey studies - which they believe will show the effects of vapor products in all their possible glory. However, the argument carries with it a lack of scientific validity.

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