Hi Spiker
I had a mate like that too - great guy but his life revolved around drinking and smoking weed - and I think, in some way, he needed me to join in.
To preserve my recovery, I had to walk away. He might have been able to live that way -I couldn't.
I lost a few drinking buddies, but the friends who stayed, and the friends I've met since, have all been 24 carat....it works out
D