Probably not going to find one in the US. Most treatment facilities are community based and the introduction of marijuana would compromise members of the community seeking recovery.
We had a client that was PISSED that we confiscated and flushed her weed. Can't really understand why someone would bring drugs into treatment.
Keep in mind, what you think is best for you probably isn't. I've found that the best way to get and stay clean is to follow the direction of those who know how to get and stay clean. Right now, most likely, there is probably a lot of fear of letting go of ALL drugs. Don't worry, that fear goes away
If you want to continue smoking weed, you may need to take the "do it yourself approach". For many addicts, this approach really doesn't work. After all, we've been doing things our own way for so long and look where it's gotten us