Vaping Could Be 'Potentially Even More' Harmful to Hearts Than Smoking, Scientists Warn Newsweek E Cigarettes and Vaping OHSU 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 E Cig Vapor vs. Tobacco Smoke: Which Is More Harmful? White Cloud White Cloud Electronic Cigarettes