An electronic cigarette or e- cigarette is a handheld electronic device that simulates the feeling of smoking. It works by heating a liquid to generate an aerosol, commonly called a "vapor", that the user inhales. Using e-cigarettes is commonly referred to as vaping. The liquid in the e- cigarette, called e- liquid, or e-juice, is usually made of nicotine, propylene glycol, glycerine, and flavorings. Not all e-liquids contain nicotine.The health risks of e-cigarettes are uncertain. They are likely safer than tobacco cigarettes but are of unclear effect in relation to other methods of stopping smoking. Their long-term health effects are not known. They may help some smokers quit. When used by non-smokers, e-cigarettes can lead to nicotine addiction, and there is concern that children could start smoking after using e-cigarettes. So far, no serious adverse effects have been reported in trials.
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