How risky is it to use e cigarettes? Smokers' beliefs about their health risks from using novel and traditional tobacco products Journal of Behavioral Medicine Springer Nature Link Scripps Health E cigarettes remain the most commonly used tobacco product among middle and high school students in the United States, according to the Instagram What are the respiratory effects of e cigarettes? The BMJ 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.