Juul study shows secondhand vaping emissions are less toxic than cigarette smoke Secondhand vape exposure regulation of CFTR and immune function in cystic fibrosis American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Digital Download Materials "Secondhand Smoke" Maine Prevention Store