Is Secondhand Vaping Harmful To Your Health? Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy 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% Solving secondhand "vape smoke" at workand at home The health risks of secondhand smoke are widely understood. But what about secondhand vaping?