Secondhand Vape Exposure: Effects, Who's at Risk, and More It's Not Just Cigarettes: Vape Residue Sticks on Surfaces Too Thirdhand Smoke Resource Center Did you know smoking leaves behind more than just smoke?Thirdhand smoke is the toxic residue left on clothes, furniture, walls, and even toys after someone smokes or vapes. These hidden chemicals Juul study shows secondhand vaping emissions are less toxic than cigarette smoke