How To Inhale A Vape Properly: MTL, DTL & RDTL Vaping Explained Mouth to Lung (MTL) vs Direct to Lung (DTL) Vaping Ecigator Vaping is now being linked to a rare and irreversible lung disease. Scientific evidence shows that inhaling e cigarette aerosols can trigger severe inflammatory injury deep inside the lungs, damaging the alveoli, Do You Inhale Vape Smoke Into Your Lungs The Impact of Smoking and Vaping on Respiratory If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs.