While early research suggests it may not be as dangerous as secondhand smoking, it's still not harmless, experts say. https: www.wate.com news does vaping cause secondhand smoke doctors explain the side effects ?utm_medium=social&utm_source Secondhand Smoke and Electronic Cigarette Aerosols US EPA Secondhand vape exposure regulation of CFTR and immune function in cystic fibrosis American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America