EVALI: New information on vaping induced lung injury Harvard Health Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Vapes and e cigarettes often contain nicotine, heavy metals, and carcinogensand can harm developing brains, affect mood and learning, and lead to lasting lung damage. Just one hit can start an addiction. First genome wide comparison of vapers and smokers finds similar DNA changes linked to disease risk