I'm waiting for a transplant. Future transplant recipients have their blood checked to a higher degree than the general population. Many of the tests have a witness present, during the drawing of blood. In states that have no medicinal marijuana programs, they are kicked out of the transplant program if their blood shows any drug, weed or alcohol. No second chances, and no retesting. You are just kicked out. I'm curious if weed releases any spores into the air that might be ingested like "secondhand smoke".