The term “electronic cigarette” refers to a battery-powered device that heats a tank or cartridge of liquid usually containingnicotine, flavorings and other chemicals, but not the cancer-causing tar found in tobacco cigarettes. Users inhale and exhale the vapor. The devices come in numerous shapes, including ones that look likepens, flash drives and hookahs. Many consumers are confused about the health implications of e-cigarettes. This is a primer about what research so far shows about these devices.
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