E cigarettes more effective than nicotine replacement therapies, finds major UK clinical trial Queen Mary University of London False fears preventing smokers from using e cigarettes to quit GOV.UK Combining electronic cigarettes and counseling helps more smokers quit Harvard Health Vaping and the Brain: Effects of Electronic Cigarettes and E Liquid Substances The Journal of Neuropsychiatry and Clinical Neurosciences Johns Hopkins Medicine Team Proposes Ways to Regulate and Better Manage E Cigarette Use Johns Hopkins Medicine