Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Health effects of electronic cigarettes Wikipedia Thirdhand Smoke Resource Center Protecting Californians Is Secondhand Vaping Something to be Concerned About? Tobacco Smoke, Vaping, and Asthma AAFA.org