Secondhand Smoke and Secondhand Vaping: Both Bad for Kids University Hospitals E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? 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 Dangers of vaping and second hand vaping are greatly underestimated Earth.com Study shows second hand vaping exposure very low compared to second hand smoking