Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN E Cigs and Second Hand Vaping: Dangers and Protections Secondhand Smoke and Electronic Cigarette Aerosol Resources US EPA Is it risky to smoke or vape around companion animals? RSPCA Knowledgebase Vaping may be causing irreversible harm to children's health, doctors say Vaping The Guardian