What Is Vaping? Expert Guide What Does A JUUL Really Do To Your Body? Franciscan Health Juuling: What you should know about the e cigarette device that's exploded in popularity among teens The Virginian Pilot Inhale this: What does vaping do to your lungs? Vaping is not replacing smoking. It is often added to it. This is called dual use. Nearly half of e cigarette users still smoke cigarettes. What this means: Smoking continues alongside vaping Juul, the vape device teens are getting hooked on, explained Vox