E cigarettes more effective than nicotine replacement therapies, finds major UK clinical trial Queen Mary University of London E cigarette use to reduce cigarette smoking may not increase nicotine dependence Penn State Health News How to quit smoking with e cigarettes N1 Vapeshop in DENVER AURORA COLORADO FDA Extends Authority to e Cigarettes: Implications for Smoking Cessation? MD Spiro E cigarette Characteristics, Safety Issues, & Regulation Britannica Latest Cochrane Review finds high certainty evidence that nicotine e cigarettes are more effective than traditional nicotine replacement therapy (NRT) in helping people quit smoking Cochrane