Teens with Moderate Mental Health Problems Using E Cigarettes Respiratory Therapy 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 Tobacco and E Cigarettes My Story Today Vaping Could Be 'Potentially Even More' Harmful to Hearts Than Smoking, Scientists Warn Newsweek