Secondhand Electronic Cigarette Aerosol and Indoor Air Quality US EPA Comparison of the chemical composition of aerosols from heated tobacco products, electronic cigarettes and tobacco cigarettes and their toxic impacts on the human bronchial epithelial BEAS 2B cells ScienceDirect What Are the Risks from Secondhand Vape Smoke? NVB Inc. Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy Secondhand smoke from vaping could be harmful to children: study ABC13 Houston Health: E Cigarettes & Second hand Smoking YouTube