E cigarette use and respiratory symptoms in adults: A systematic review and meta analysis 7 things to know about e cigarettes and quitting smoking Centre for Evidence Based Medicine (CEBM), University of Oxford 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 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