Hows does e-cigarette work

An e-cigarette is a battery-powered device that converts liquid nicotine into a mist, or vapor, that the user inhales. There's no fire, no ash and no smoky smell. E-cigarettes do not contain all of the harmful chemicals associated with smoking tobacco cigarettes, such as carbon monoxide and tar. Manufacturers and satisfied customers say the e-cigarette is a healthier alternative to tobacco cigarettes, which cause millions of deaths every year. Some users say e-cigs have helped reduce their "smoker's cough," sharpened their senses of taste and smell, and even improved their sleep. The electronic cigarette was invented by Chinese pharmacist Hon Lik, who patented the device in 2003 and introduced it to the Chinese market the following year. Numerous companies are now selling e-cigarettes to customers around the world. But as e-cigarette smoking -- or "vaping" as it's sometimes called -- has grown in popularity, some have concerns about its safety, including the possibility that the vapor created by the devices contains dangerous chemicals.