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Retrieved August 24, 2013

E-cigarettes do not burn tobacco, instead the mechanism heats up a liquid, which turns into vapor and is then inhaled or "vaped." E-cigs atomize a propylene glycol solution, sometimes called e-liquid, that may include additional flavorings, colorings or variable amounts of nicotine concentrations

Animal Bioassays Researchers have tested the carcinogenic ability of tar in cigarette smoke in laboratory animals for more than nine decades and in animal inhalation studies of machine-generated cigarette smoke for more than five decades (Wynder and Hoffmann 1967)

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While e-cigarettes -- like the popular Juul -- do not contain tobacco, they do have the addictive substance nicotine and are marketed in a variety of flavors that critics say are meant to appeal to young people

A white or red patch on your tongue, gums, or anywhere on the inside of the mouth