E Cigarettes and Associated Health Risks: An Update on Cancer Potential Analysis suggests e cigarette use may be linked to lower rates of smoking 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 cigarettes: 'cancer risk close to zero' Bhekisisa Know the Risks: E cigarettes and Young People Community Commons