Vaping weed is popular, but there are many unknowns about its safety : NPR How Long Do You Stay High After Hitting A Pen Most people switch to dry herb vaping for one reason but stay for another. Here's the real lesson: Combustion = smoke, lingering odor, and byproducts you may not want Vaporization = 5 Methods Teens Use to Mask the Smell of Marijuana Teen vaping tied to marijuana use Get Smart About Drugs