Fast facts on the effects of e cigarettes and vaping 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 Vaping and Electronic Cigarette Toxicity Overview and Recommendations (Project VECTOR) Intrepid Lab Secondhand smoke and aerosol What is e Cigarette and Associated Health Risks IntechOpen