There are no safe tobacco products, and yes, that includes vapes. The sleek, battery powered devices heat up liquid packed with nicotine and other harmful chemicals that turn into an aerosol you inhale What is MTL Vaping? What Does Mouth to Lung Inhaling Mean? If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs. How to Hit a Pen Perfectly Your First Time Vaping For Beginners: How Do You Inhale and Exhale Vapor? Medical Marijuana, Inc.