What Are the Risks from Secondhand Vape Smoke? NVB Inc. Secondhand smoke and aerosol Many people assume vaping is harmless to bystanders, but secondhand aerosol can contain ultrafine particles and chemical residues. Researchers are examining how exposure may affect airways and overall health, especially for children Juul study shows secondhand vaping emissions are less toxic than cigarette smoke Vaping, Second Hand Smoke, and Kids Medical Associates of Northwest Arkansas Secondhand vape exposure: Risks and side effects