Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN FDA OKs First Vaping Products as Smoking Cessation Aids RT Psychiatry.org E Cigarettes and Vaping Vaping and the Brain: Effects of Electronic Cigarettes and E Liquid Substances The Journal of Neuropsychiatry and Clinical Neurosciences E cigarettes, heated tobacco and smokeless tobacco products European Lung Foundation