E-cigarettes are battery-powered devices that work by heating a liquid into an aerosol that the user inhales and exhales. The e-cigarette liquid typically contains nicotine, propylene glycol, glycerin, flavorings, and other chemicals.
E-cigarettes claim to bypass many of the health risks of tobacco smoking and to offer a more healthful alternative to cigarettes and other conventional forms of nicotine intake. Some studies have found that using e-cigarettes can help some smokers quit.
Low doses may cause nausea, vomiting, abdominal pain, and eye irritation. High doses of nicotine may cause tachycardia, high blood pressure, seizures, coma, and death. Moreover, the FDA reported detecting ethylene glycol in some of the e-cigarettes and cancer-causing substances called nitrosamines in others.
While e-cigarettes are considered less risky than cigarettes, they may still damage the lungs. E-cigarette aerosols typically contain nicotine, additives and other contaminants that can affect normal lung biology, and in vitro studies have shown that e-cigarettes can modify lung epithelial and endothelial cell biology