What Are Electronic Cigarettes? NIH News in Health Marijuana and Your Lungs: Is Vaping Safe for People with COPD? Vaping Lung Illness: Why E Cigarettes' Dangers Might Get Worse The Atlantic Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Can vaping help wean people off cigarettes? Anti smoking advocates are sharply split : Goats and Soda : NPR