(See: Grana R, Benowitz N, Glantz SA. E-Cigarettes: A Scientific Review. Circulation 2014; 129: 1972-1986.)

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.

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