Electronic cigarettes work by vaporising a solution that usually contains nicotine

The UK and New Zealand researchers behind the Cochrane Library review say the results are encouraging but that more studies are needed. The review drew on data from 662 smokers across two randomised trials, and found that about 9% of those who used electronic cigarettes were able to quit smoking by the one-year mark – more than twice the rate of those using nicotine-free placebo devices.