What happens if you swallow the vape smoke? Even if you dont inhale while vape smoking, your mouth, throat, and lips are exposed to harmful chemicals, as is your oesophagus when you swallow saliva that contains the chemicals. , There is a MTL vs. DTL inhaling demonstration If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs. How to Vape Like A Pro: A Simple Guide for Beginners