Electronic cigarettes heat liquid (which may contain nicotine) to make vapour for inhalation. They are intended to simulate smoking traditional combustible cigarettes and give smokers the feeling and pleasure of traditional smoking but without the flame, tar, ash or other products of combustion. Ethical traders and manufacturers market, label, and sell recreational nicotine products solely for adult use as an alternative to conventional cigarettes.
The use of vaporised nicotine as an alternative to smoke was suggested in 1963 when a patent was filed in the US for The Smokeless Non-Tobacco Cigarette: 
The present invention relates to a smokeless non-tobacco cigarette and has for an object to provide a safe and harmless means for and method of smoking by replacing burning tobacco and paper with heated, moist, flavored air; or by inhaling warm medication into the lungs in case of a respiratory ailment under direction of a physician.
In 1987 the US FDA closed the consumer market for the “Favor Smokeless Cigarette” by classing it as a medical product. It was a small tube containing “a plug impregnated with a nicotine solution” that allowed the user to inhale nicotine vapor and it was marketed to provide “cigarette satisfaction without smoke”.
The latest electronic cigarettes were patented in China by Hon Lik in 2003 and have been widely available to consumers since 2004. They are not designed for and generally should not be labelled or marketed as a means to quit smoking without a medical license. Some countries have banned the use and/or trading of ecigs by using medical, poisons and tobacco control legislation. Other countries are regulating under general consumer protection legislation. There are no ecigs or nicotine liquids with medical licenses, probably because that market is not profitable for manufacturers and traders.
The main issues currently surrounding electronic cigarettes are summed up by Thomas J. Glynn, PhD as follows -
Proponents of e-cigarettes list as benefits:
Those with concerns about e-cigarettes warn of:
Web Search Interest over time:
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