An Umbrella Review of E Cigarettes' Impact on Oral Microbiota and Biofilm Buildup 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 Conclusions about the effects of electronic cigarettes remain the same Cochrane