My son will be 18 soon and is addicted to weed, he is aggressive and abusive. Can anyone tell me what actually happens when18th birthday comes up? Do they write to the child? Can I stop it from maturing or whatever it does. I am really panicking as I have had a massive altercation with him where he admits spending a fortune every week on weed. I plan to ring the company but after tonight don't think I will sleep at the thought of him having any more money to harm himself with.