E cigarettes and nicotine abstinence: a meta analysis of randomised controlled trials European Respiratory Society Electronic cigarettes use and 'dual use' among the youth in 75 countries: estimates from Global Youth Tobacco Surveys (20142019) Scientific Reports E Cigarettes and Cardiopulmonary Health: Review for Clinicians Circulation 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