What is Mouth to Lung and Direct to Lung Vaping? Vape Blogs Vapor Shop Direct Mouth to Lung vs Direct to Lung: Meaning and Differences If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs. 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 Puff Vs Inhale How to Hit a Vape Like a Pro Vape Direct Does Vaping Cause Lung Cancer? What We Know (and Still Don't)