Mouth to Lung (MTL) Vs Direct Lung (DL) Inhale Explained E Cigarette Direct Vaping and smoking together increases lung cancer risk fourfold MTL or DTL: Mouth to Lung vs Direct to Lung Vape Guide 2019 Vape Lungs Vs Smoker Lungs What vaping does to your body Today's Fact Friday highlights an important truth. Both cigarettes and e cigarettes are harmful to your health. While some believe vaping is a safer alternative, studies show that one disposable vape can equal Learn the truth: vapes are not safe smoking alternatives