Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN 5 Vaping Facts You Need to Know Johns Hopkins Medicine How secondhand smoke, thirdhand smoke & vaping affects kids How Long Does Second Hand Smoke Stay in Your System Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America