My son has been an addict for ten years, taking meth, weed, alcohol, crack cocaine, etc. He tells me that the WEED is what got him started. It led him to experiment with other drugs. (Do you know for sure that he’s not taking other drugs? Sometimes the parents are the last to know). I would try to get him counseling and also have him see an M.D., who will advise him that marijuana adversely affects young people – it can cause brain damage, and it increases the chance of getting schizophrenia/psychosis.