Marijuana high: Strains, smoking, vaping, and edibles 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. Over 2 million kids use e cigarettes, and 4,000 try vaping every day. As students return to school, the risk of use increases through new stressors and peer pressure. Through our new youth Lessons to Address High School Vaping Everfi