Vaping isn't just vapor. It's an aerosol filled with nicotine and chemicals that go deep into your lungs and straight into your bloodstream. Many vapes contain: Highly addictive nicotine How To Know When Juul Is Done Charging How Do You Know When The Juul Is How To Fix a Juul How Do You Know A Juul Is Fully Charged Juul, the vape device teens are getting hooked on, explained How Do You Charge A Juul Vape How Do You Know When The Juul Is Fully Can Vaping Cause Lung Cancer? Here's What We Know.