Studies show that the negative health effects of e cigarettes are like that of traditional cigarettes. A Parkview expert explains the dangerous combination of highly addictive nicotine and the chemicals in e liquid. U.S. e cigarette use stalls as health concerns grow: Reuters Ipsos poll Reuters Monsignor Farrell High School takes measures to prohibit vaping silive.com 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.