Unlike the traditional cigarette that causes the tobacco to burn, the electronic version does not need fire. The smoker breathes in the smoke so that the nicotine can reach the lungs and then the brain. The electronic cigarette does not function using the process of combustion, but instead heats a nicotine liquid that is transformed into vapors. Thus, the smoker actually inhales vaporous nicotine when he inhales.
http://lerablog.org/technology/electronics/interesting-facts-about-e-cigarettes-and-the-top-myths-busted/
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