People say weed is safe because it's natural but I have to ask that if these people know you can get lung cancer and black lung by sitting around camp fires to much. In fact, if the naturally grown trees we cut down to burn produce to much smoke, and it is inhaled, it can cause death by smoke inhalation. Also, just because something is natural, doesn't mean it's safe. Case in point, asbestos. It's a naturally occurring mineral and is extremely common in northern california. So common, it litters the hillside in the northern part of the state.