From the referenced article:
"An electronic cigarette, or e-cigarette, also known as an.ecig, is an electrical
device that simulates the act of
tobacco smoking by producing an inhaled vapor bearing the physical sensation, appearance, and often the flavor and nicotine content of inhaled
tobacco smoke, without its odor or, ostensibly, its health risks. The device uses heat (or in some cases, ultrasonics) to vaporize a propylene glycol- or glycerin-based liquid solution into an aerosol mist, similar to the way a nebulizer or humidifier vaporizes solutions for inhalation."
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