This, from The Telegraph UK:

"NHS could start prescribing e-cigarettes as study finds them 60% more effective than gum or patches"

By-line: "Although e-cigarettes are not yet licenced by the Medical and Healthcare products Regulatory Agency, researchers at University College London said new evidence showed they were extremely effective at helping smokers to quit"

Could just ask a few vapers; save the research money...

Cheers,

TiD