Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times A Single Session of Vaping Can Hurt Your Lungs 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 No judgment just real talk , , If you smoke, vape, whatevercool., But you still gotta take care of your lungs., , Your body wants to clear mucus, Buildup = thicker phlegm + breathing