E Cigarettes Linked To Lung Cancer 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. E Cigarette User Has Rare Form of Lung Scarring Typically Found in Metal Workers Scientific review finds e cigarettes likely cause lung and oral cancer Los Angeles Times About E Cigarettes (Vapes) Smoking and Tobacco Use CDC