A scientific review has raised fresh concerns about the long term cancer risks of vaping, concluding that e cigarettes are probably carcinogenic, while also acknowledging significant gaps in the evidence. The analysis of reviews Evidence update on the respiratory health effects of vaping e cigarettes: A systematic review and meta analysis UCLA researchers find new evidence that e cigarettes may harm your heart UCLA Electronic cigarette Wikipedia New Study Provides Strong Evidence That E Cigarettes Boost Smoking Cessation