E cigarettes can result in 'Popcorn Lung' Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Vaping vs Smoking: Which Is More Dangerous for Your Lungs? Aster Hospitals Health effects of electronic cigarettes Wikipedia Is vaping bad for you? Where There's Vapor, Is There Fire? We Need Evidence on E Cigarettes RAND