I quit smoking pot after 30 years. I go to counseling and attend N/A meetings. My 16 yr old son is addicted to pot also. I had him arrested to get help from juvenile court and he is in a drug program with them. It still isn't helping. He's been to treatment. Treatment is only good while they are there. They still have to deal on the outside. They have to make new friends. Only God can change people. All you can do is pray for him. He has to be ready to quit before it will happen. The pain has to be greater than the pain of change. Be careful he doesn't start stealing from you. They will do what they have to do in order to get it.