This is a question regarding someone who has pain in back, neck and wrist (due to car accident a few years ago causing 3 herniated discs) and they found a doctor (New York City) who has given prescription for Marijuana (3times day and as needed). This person wants to avoid taking opioids due to addictive nature and cant take Tylenol due to liver weakness. The state is about to approve it for him for his pain. Is it allowed for him to take it? According to Sistani and according to Ayatolllah Khamenei?