The citation provided to back up this assertion is a by Vardavas et al. (Vardavas, C.I.; Anagnostopoulos, N.; Kougias, M.; Evangelopoulou, V.; Connolly, G.N.; Behrakis, P.K., "Short-term pulmonary effects of using an electronic cigarette: impact on respiratory flow resistance, impedance, and exhaled nitric oxide," Chest 141(6): 1400-1406, June 2012.).

(See: Dutra LM, Glantz SA. Electronic cigarettes and conventional cigarette use: a cross-sectional study. Published online March 6, 2014. JAMA Pediatr. doi:10.1001/jamapediatrics.2013.5488.)

If "they are not harmless" is the worst that opponents can say about electronic cigarettes in 2014, then there doesn't seem to be much of a controversy over whether these products are much safer alternatives to smoking. Likewise, there doesn't appear to be much of a controversy over whether switching to e-cigarettes is a wise choice for smokers who want to quit but feel unable to do so cold turkey (which is, of course, the best option).

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