E-cigarettes appear to be less addictive than cigarettes in former smokers and this could help improve understanding of how various nicotine delivery devices lead to dependence, according to researchers. Although many regular users of e-cigarettes are trying to quit smoking, the Food and Drug Administration has not approved them for this use, and they cannot be marketed as a smoking cessation product.
The popularity of E-cigarettes, which typically deliver nicotine, propylene glycol, glycerin and flavorings through inhaled vapor, has increased in the past five years. There are currently more than 400 brands of “E-cigs” available. E-cigs contain far fewer cancer-causing and other toxic substances than cigarettes, however their long-term effects on health and nicotine dependence are unknown.