E-cigarettes come in many shapes and sizes. Most have a battery, a heating element, and a place to store liquid. E-cigarettes produce an aerosol by heating a liquid that usually contains nicotine—the addictive drug in regular cigarettes—flavorings, and other chemicals. Users inhale this aerosol into their lungs. Bystanders  can also breathe in this aerosol when user exhales into the air.

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