Secondhand e cigarette vape smoke exposure increased in last 4 years, contain harmful toxins: JAMA Network study ABC7 Chicago Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand vape exposure regulation of CFTR and immune function in cystic fibrosis American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Second hand vape smoke linked to more asthma symptoms in kids Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN