E Cigarettes Show Surprising Efficacy in Smoking Cessation Respiratory Therapy E cigarettes can be effective smoking cessation aids, Cochrane review suggests The Pharmaceutical Journal Electronic cigarettes: Help or hazard? Harvard Health E cigarette Characteristics, Safety Issues, & Regulation Britannica E cigarettes more effective than nicotine replacement therapies, finds major UK clinical trial Queen Mary University of London FDA Extends Authority to e Cigarettes: Implications for Smoking Cessation? MD Spiro