Growing the research evidence on e cigarettes by Research at CRUK Medium Latest Cochrane Review finds high certainty evidence that nicotine e cigarettes are more effective than traditional nicotine replacement therapy (NRT) in helping people quit smoking Cochrane Broad evidence implicates e cigarettes as a cause of cancer Stanton Glantz blog More e cigarette users than cigarette smokers for the first time in the UK The Lancet Oncology Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis