Have you been thinking about trying vapes or e cigarettes? Think again! Most e cigarettes contain nicotine and other harmful substances. Some products claiming to be nicotine free have been found to contain nicotine. Nicotine E Cigarettes Found More Harmful Than Thought E Cigarette Use Among Youth Smoking and Tobacco Use CDC Smoking and vaping are often compared, but neither is harmless. While they work differently, both can expose the lungs to addictive nicotine and harmful chemicals that impact breathing and overall health. Smoking Vaping Could Be 'Potentially Even More' Harmful to Hearts Than Smoking, Scientists Warn Newsweek