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An
electronic cigarette, or
e-cigarette, is an
electrical device that attempts to simulate the act of
tobacco smoking by producing an
inhaled mist bearing the physical sensation, appearance, and often the
flavor and
nicotine content of inhaled tobacco smoke. 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.
Most electronic cigarettes are designed to resemble actual tobacco smoking implements, such as cigarettes, cigars, or pipes, but many take the form of
ballpoint pens or
screwdrivers since those designs are more practical to house the mechanisms involved. Most are also reusable, with replaceable and refillable parts, but some models are
disposable.
The primary stated use of the electronic cigarette is as a
smoking cessation device, as it attempts to deliver the experience of smoking without, or with greatly reduced, adverse health effects usually associated with tobacco smoke. Nevertheless, concerns have been raised that use of the device still carries health risks, and that it could appeal to non-smokers, especially
children, due to its
novelty,
flavorings, and possibly overstated claims of safety.
The possible benefits or adverse effects of electronic cigarette use are a subject of disagreement among different health organizations and researchers.
Controlled studies of electronic cigarettes are scarce due to their relatively recent invention and subsequent rapid growth in popularity. Laws governing the use and sale of electronic cigarettes, as well as the accompanying liquid solutions, currently vary widely, with pending
legislation and ongoing debate in many regions.
The electronic cigarette was invented by Chinese pharmacist Hon Lik in 2003 and introduced to the market the following year. The company he worked for, Golden Dragon Holdings, changed its name to
Ruyan (meaning "to resemble smoking"), and started exporting its products in 2005–2006,
[1] before receiving the first international patent in 2007
http://en.wikipedia.org/wiki/Electronic_cigarette