All e-cigarettes work the same way, producing vapor and not smoke. The question many ask is: is it safer than tobacco cigarettes? A lot of research has been found and the complete answer is not yet provided. What I can provide is information on negative and positive side effects. Without all the chemicals found in a regular cigarette, e-cigarettes contain nicotine. Nicotine is an addictive drug, when you stop using it you may experience withdrawal symptoms such as: restlessness, depression, anxiety, irritability and over time it can also cause heart problems. The biggest danger from tobacco is smoking, and e-cigarettes don't burn. Tests show that the levels of dangerous chemicals they emit are a fraction of what you'd get from a real cigarette, but what they contain can vary. Early e-cigarettes did not produce the powerful nicotine high produced by burning tobacco. So engineers developed technology that allows users to increase the voltage of the e-cigarette to create more nicotine with each puff. Research has shown that because nicotine is addictive, e-cigarettes could be a “gateway drug,” leading non-smokers and children to use tobacco. A common concern is that manufacturers may popularize smoking