Analysis suggests e cigarette use may be linked to lower rates of smoking E cigarettes, commonly known as Vapes are systems that heat a liquid to create aerosols that are inhaled by the user. Here are some facts to note about vaping: Vape emissions typically contain Everything you need to know about composition of e cigarette liquids VapeMall 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.