Hi and welcome concernedbenpen
I moved your post here for more response - you posted in out chat admin forum which is not the chat room
Its tough when you have a friend in trouble like this. I really think the only thing you can do is communicate your concern and let him know you're there to support him.
The actual decision to quit has to be his - I don;t know of any other way recovery works.
btw the chat room link is:
https://www.soberrecovery.com/forums/achat.php
D