One of my best friends is slipping farther has an ongoing addiction to Oxi-cotton. He has been to rehab multiple times (more than 5 or 6 over the years) but never stays clean...just lies more. He has completley abandonded our circle of friends which he has been apart of since jr high school (we are 21 now). He hangs out with these scum bags that deal oxi-cotton, and snort that shit up his nose all day and who knows what else. When I confront him about any of this bullshit which is becoming worse and worse he lies to my face like he used to lie to his dad when we would smoke pot back in high school . I don't know what I should do and am considering just beating the shit out of him untill his nose is so mangled he can't snort that shit up it anymore.