An electronic cigarette or ”e-cigarette” is an alternative to smoked tobacco products, such as cigarettes, cigars, orpipes. It is a battery-powered device that provides inhaled doses of nicotine by delivering a vaporized propylene glycol/nicotine solution. In addition to nicotine delivery, this vapor also provides a flavor and physical sensation similar to that of inhaled tobacco smoke, while no tobacco, smoke, or combustion is actually involved in its operation. The legal status of electronic cigarettes varies by country.
An electronic cigarette usually takes the form of some manner of elongated tube, though many are designed to resemble the outward appearance of real smoking products, like cigarettes, cigars, and pipes.
When a user inhales through the device, air flow is detected by a sensor, which activates a heating element thatvaporizes a nicotine solution stored in the mouthpiece. It is this vapor that is inhaled by the user. On some models a LED on the opposite end of the device is also activated during inhalation, which serves as an indicator of use, and simulates the glow of actual burning tobacco.
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