Mouth to Lung (MTL) Vs Direct Lung (DL) Inhale Explained E Cigarette Direct Vaping Might Feel SafeUntil It Isn't. Just because it smells sweet and feels light doesn't mean it's harmless. Many believe vaping is a safer choice, but is it really? Pulmonologist Think vaping is safer than smoking? You might be surprised to learn the facts tell a different story. In our newest Baptist HealthTalk episode, pulmonologist Dr. Sosa breaks down what's actually inside Can Vaping Cause Lung Cancer? Here's What We Know. What Does Vaping Do to Your Lungs? Johns Hopkins Medicine If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs.