While I can't say from experience, I've read that many drugs do what adhd meds do - increase dopamine in the brain. That's why they call it medicating.
Getting him on adhd meds would probably help, but if he's been doing it for that long, I'd guess you'd be in for the long haul.
So. Have you decided you will not deal with this? Or will you work through it with him? Or will you accept him as he is, not arguing with him about it until he's ready? Clearly, you have a POV. Make sure it isn't a reaction, but a carefully considered and considerate response.
