The impact of e cigarette exposure on different organ systems: A review of recent evidence and future perspectives ScienceDirect Dr. David Nutt of Imperial College London said that scientific evidence clearly shows e cigarettes and other less harmful alternatives are much safer than smoking and can support smoking cessation. Read the About E Cigarettes (Vapes) Smoking and Tobacco Use CDC Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times