Scientific review finds e cigarettes likely cause lung and oral cancer Los Angeles Times Is the Increase in Teen Vaping Affecting Lung Cancer Rates? Cancer Therapy Advisor About E Cigarettes (Vapes) Smoking and Tobacco Use CDC 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.