E-cigarettes can help smokers quit the habit and also lower the risk of nicotine dependency in high-risk groups.

According to repeat surveys in the U.K., the number of people who were aware of e-cigarettes doubled between 2010 and 2012, and the number of users increased four-fold. An online survey of e-cigarette users found that 74% of those asked had not smoked tobacco for at least several weeks since using e-cigarettes, and 70% reported reduced cigarette cravings. However, there is evidence that people who have never previously smoked also use e-cigarettes.
The rates among Polish and US students, for example, were 3% and 9% respectively. Only two controlled trials show e-cigarettes as having similar effects to nicotine replacement therapies as smoking cessation aids; these effects were almost independent of nicotine content. The authors call for more randomized trials to be conducted.
Source-Eurekalert