Both conventional tobacco products and e cigarettes pose risks to health. E cigarette use can negatively impact the health of your brain, lungs and heart and it is linked to an increased risk of Hamm Germany 092019 E cigarette Iqos Philip Stock Photo 1493880917 Shutterstock Smoking: Effects, Risks, Diseases, Quitting & Solutions 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. Tabaco Para Iqos Sin Nicotina Perceived relative harm of heated tobacco products (IQOS), e cigarettes, and cigarettes among adults in Canada: Findings from the ITC Project