E cigarettes a tool to reduce inequalities in smoking? UCL Institute of Epidemiology and Health Care Blog Do e cigarettes kill you? Researchers don't know. Vox Cigarettes, Smokeless Tobacco, and Vapes: Key Facts for Quitting and Staying Healthy Maryland Physicians Care What We Know About Vaping Smokefree E cigarettes can help people quit smoking but may be gateway for non smokers, studies suggest ABC News Are E Cigarettes a Healthy Way to Quit Smoking? WSJ