Turn it Off: A Patient's Advice about Oxygen and Smoking Be a Good Neighbor Respect Smoke and Vape free Zones Infographic US EPA Warning: Etomidate in Vapes Some vapes are laced with etomidate and other dangerous drugs. It can damage your brain, disrupt your heart function, and cause fatal breathing problems. Does Vaping Cause Lung Cancer? What Happens When You Quit Smoking and Start Vaping? Can Doctors Tell If You Vape? You might think vaping is invisible but your doctor may spot the signs From breathing changes to nicotine testing, vaping can leave clues behind.