e Cigarettes Safety Not Yet Proven CANSA The Cancer Association of South Africa CANSA The Cancer Association of South Africa Vaping and Electronic Cigarette Toxicity Overview and Recommendations (Project VECTOR) Intrepid Lab E Cigarettes and Eco Consequences The Health Impacts of E Cigarettes 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.