An electronic cigarette, also known as an e-cigarette, vapor cigarette or an e-cig, is an electrical inhaler that vaporizes a propylene glycol-, glycerin-, or polyethylene glycol-based liquid solution into an aerosol mist, simulating the act of tobacco smoking. It is often marketed as a smoking cessation aid or tobacco replacement. The similarities between conventional and electronic cigarettes are in the physical design and the nicotine release, which is approximately the same amount of nicotine as a conventional cigarette.

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