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 Is Vape Smoke Bad For Second Hand Evidence Mounts About the Health Impact of Second Hand Vaping Secondhand Smoke and Electronic Cigarette Aerosols US EPA Secondhand cigarette smoke is a combination of smoke from the burning end of a cigarette and the smoke breathed out by smokers. Exposure to secondhand smoke has been linked to cardiovascular disease,