Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Secondhand exposure from vaping marijuana: Concentrations, emissions, and exposures determined using both research grade and low cost monitors ScienceDirect Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Secondhand smoke and secondhand aerosol Secondhand smoke from cigarettes worse than vapes UPI.com