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Though vaping exposes the us er to fewer toxic substances than smoking, it is not harmless: the aerosol inhaled and exhaled during vaping may contain nicotine, heavy metals, and carcinogens.Encouragingly the levels of carcinogens and toxins in e-cigarettes are much lower than in cigarettes, and short-term studies suggest that smokers who switch to vaping do experience reduced exposure to carcinogens

Am J Respir Crit Care Med 191:285291 Moretto N, Facchinetti F, Southworth T, Civelli M, Singh D, Patacchini R (2009) alpha, beta-Unsaturated aldehydes contained in cigarette smoke elicit IL-8 release in pulmonary cells through mitogen-activated protein kinases

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