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.).

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