Teen Smoking UT MD Anderson Why do People Vape? 10 Main Reasons Secondhand Vape Exposure: Effects, Who's at Risk, and More What You Need to Know About Vaping Smoking and vaping are often compared, but neither is harmless. While they work differently, both can expose the lungs to addictive nicotine and harmful chemicals that impact breathing and overall health. Smoking Why Youth Vape Smoking and Tobacco Use CDC