E-cigarettes are the most common and typical form of electronic nicotine delivery systemor electronic non-nicotinedelivery system, which transmits aerosol by heating a solution for users to inhale.The main components of e-cigarettes, in addition to nicotine (if any), include propyleneglycol, and possiblyglycerin and odorants.The liquid used in e-cigarettes and their emissions also contain other chemicals, someof which are considered toxic. Some e-cigarettes are similar in shape to tobacco products (such as cigarettes, cigars,pipes, or hookahs), and some are in the shape of daily necessities, such as pens, USB memory sticks,etc.

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