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. Health Effects of Vaping Smoking and Tobacco Use CDC E Cigarettes: Know the Health Risks Department of Health Information About Student Vaping for Curriculum Coordinators, Health Educators, and Teachers Mass.gov The Effects of Vaping on Oral Health