Breathing in someone else's smoke or vape isn't harmless. Secondhand smoke exposure can affect your lungs, brain, and overall health. Protect your families and yourself. Inhalar el humo o el vapor de Chemicals Secondhand Smoke and Secondhand Vaping: Both Bad for Kids University Hospitals Don't Be Fooled, E cig Aerosol Is Not Harmless for Kids American Lung Association Does Vaping Cause Secondhand Smoke? According to the American Heart Association, the risks of secondhand smoke from vapes are still being discovered. Learn about the dangers of secondhand smoke from vapes.