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 Thirdhand Vapor from E cigarettes Damages the Lungs of Mice Thirdhand Smoke Resource Center Vaping Robert Lesslie Vaping causes cancer: new findings Vaping and smoking together increases lung cancer risk fourfold Use of e cigarettes after quitting smoking increases lung cancer risk Cancerworld Magazine