E cigarettes contain hazardous substances, addictive and harmful Print and Download About Vaping Prevention Resources HHS.gov Vaping Versus Smoking: Are Electronic Cigarettes the Savior? Arteriosclerosis, Thrombosis, and Vascular Biology How E Cigarettes Affect Your Body Vaping has become common, but it's important to know what you're inhaling. Many e cigarettes contain nicotine, heavy metals like nickel and lead, and chemicals that can harm your lungs and overall health. The Negative Impact of E Cigarette Use on Heart Health