In secondhand vape, scientists smell risk American Heart Association First, Second and Thirdhand Smoke: The Differences and Dangers Tobacco Stops With Me While vaping is not risk free, it is less harmful than tobacco Our World in Data Secondhand nicotine vaping at home and respiratory symptoms in young adults Thorax Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN