Perhaps you want to see if he is serious and suggest a detox program. I hear detox is dangerous if done on your own. MY AH (see people I dropped the R, just because he isn't drinking doesn't make him R) took my son out to tell him he was going into rehab and said, "I'll have to have a few drinks or I'll be flipping out." Luckily, we have a restaurant within walking (staggering) distance of our house. First days in detox he called me every day with news of withdrawal, sweating, heart rate, quack quack.
Let the experts handle detox, and take a bubble bath while they do.