Second hand nicotine vaping exposure raises risk for bronchitis, breathing problems UPI.com Is Secondhand Vape Smoke Bad For Pregnancy? Experts Explain The Risks According to a Centers for Disease Control and Prevention (CDC) study, 40% of U.S. adults believe that children's exposure to secondhand aerosol from e cigarettes causes only some or little harm, and 5% 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