Welcome
I agree totally with the above. For one thing, anyone with a "rational mind" would pay their expenses before beer and pot. Geez, that must be a few hundred a month right there! Sounds like he expects to be "parented," and I'm sure you didn't sign up for that.
While you might post on the "friends and family" forum, tell him to log on HERE. We fellow alcoholics will both help him quit if he is willing PLUS we'll let him know what we think about his behavior regarding his "living arrangements."
Your intentions are good, but the effect will guarantee that he never seeks help or decides to "grow up."
Good luck to you.
warrens