If you honestly think you have an addiction, as far as I know, there's no recovery program for MJ. I guess maybe AA? Same principle, from what I've been told. My best friend is actually in recovery for MJ, too; she was smoking ALL DAY EVERY DAY. But she's in AA here; we have NA, too, but she said that's for the really hard-core people.

Other than that, like has been mentioned, keep yourself busy and remember the first couple of days are the hardest. The self-talk that was suggested was excellent advice, just keep telling yourself that you can do this, you're stronger than this, etc.