E cigarettes more effective than nicotine replacement therapies, finds major UK clinical trial Queen Mary University of London 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 E cigarettes: misconceptions about their dangers may be preventing people from quitting smoking Centre for Evidence Based Medicine (CEBM), University of Oxford