Effectiveness of Electronic Cigarettes as a Tool for Smoking Cessation or Reduction.

To examine the evidence concerning effectiveness of electronic cigarettes (e-cigarettes) in smoking cessation or reduction and reduction in desire to smoke and withdrawal symptoms. A PubMed literature search through May 2014 was performed using search terms or or ; and or limited to clinical trials in humans. Cochrane Library and International Pharmaceutical Abstracts were searched using the term .