Dor,
Alateen is a good resource too, if he hasn't already tried it. Again, a 3rd party may be the best to make that suggestion.
Givelove and Laurie are right - you have to let him make his own path - stumbles, slips, successes, and everything else. He knows you care and that counts for alot.
And Happy New Year. Don't forget to focus on yourself - you deserve that much.