e-cigarretes apparently also poses health risks.. atleast that is what the FDA and others researchers warn for, due to lack of research on the toxic chemicals they've found in the e-cigs..(not that i believe everything FDA says but...)

MAYO CLINIC: The prestigious Mayo Clinic warns patients and visitors to its web site that "when the FDA analyzed samples of two popular brands, they found variable amounts of nicotine and traces of toxic chemicals, including known cancer-causing substances (carcinogens). This prompted the FDA to issue a warning about potential health risks associated with electronic cigarettes. Until more is known about the potential risks, the safe play is to say no to electronic cigarettes. If you're looking for help to stop smoking, there are many FDA-approved medications that have been shown to be safe and effective for this purpose.
http//www.mayoclinic.com/health/electronic-cigarettes/AN02025

and also on [link to www.sciencedaily.com]