Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Secondhand vape exposure: Risks and side effects Secondhand smoke and secondhand aerosol About one in four adults in California report being exposed to secondhand smoke or vape in the past two weeksoften on sidewalks, at home, and in recreational spaces like parks and beaches. Secondhand vape exposure detectable in children's saliva, breath Contemporary Pediatrics