The dirty, dangerous secret of California's legal weed Los Angeles Times Why Weed Pens Use Distillate with Cannabis Derived Terpenes STIIIZY Cannabis information Dank Vapes, TKO and Other THC Vaping Brands Are Linked to Illnesses, C.D.C. Says The New York Times A Breakdown of Weed Pen Types: Which One Suits You? Blog Verts Dispensary Vaping weed is popular, but there are many unknowns about its safety : NPR