Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America Is it risky to smoke or vape around companion animals? RSPCA Knowledgebase Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN