E cigarettes a tool to reduce inequalities in smoking? UCL Institute of Epidemiology and Health Care Blog The Dangers of Vaping and Oral Nicotine Use Among Youth Vaping and E cigarettes American Dental Association E cigarettes & Vaping Positive Choices 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. Dr. Nancy Snubs Out E Cigarette Myths