Conclusions about the effects of electronic cigarettes remain the same Cochrane The effect of e cigarettes on smoking cessation and cigarette smoking initiation: An evidence based rapid review and meta analysis 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 Electronic cigarette use and smoking cessation in cohort studies and randomized trials: A systematic review and meta analysis The impact of e cigarette exposure on different organ systems: A review of recent evidence and future perspectives ScienceDirect