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. The Dangerous Truth Behind E Cigarettes Advanced DDS HealthMatch Vaping may be safer than cigarettes, but it's not safe Vaping Versus Smoking: Are Electronic Cigarettes the Savior? Arteriosclerosis, Thrombosis, and Vascular Biology Health effects and known pathology associated with the use of E cigarettes ScienceDirect