Vaping weed is popular, but there are many unknowns about its safety : NPR How Long Does Marijuana (Weed) Stay in Your System? 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 = Do Vapes Smell And What Can You Do About It? RQS Blog If someone smokes outside, do they bring thirdhand smoke indoors with them? Thirdhand Smoke Resource Center