are e cigarettes a safe alternative to smoking Is vaping smoking? Why Use An E-Cigarette –

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[136] Tobacco-specific nitrosamines (TSNAs) such as nicotine-derived nitrosamine ketone (NNK) and N -Nitrosonornicotine (NNN) and tobacco-specific impurities have been found in the e-cigarette vapor at very low levels, [114] comparable to amounts found in nicotine replacement products