Efficacy and Safety of E Cigarette Use for Smoking Cessation: A Systematic Review and Meta Analysis of Randomized Controlled Trials The American Journal of Medicine Interventions for smoking cessation: An overview of Cochrane reviews E Cigarettes and Their Dangers Amazon.com.br E cigarettes and nicotine abstinence: a meta analysis of randomised controlled trials European Respiratory Society 7 things to know about e cigarettes and quitting smoking Centre for Evidence Based Medicine (CEBM), University of Oxford Conclusions about the effects of electronic cigarettes remain the same Cochrane