Within the broad context of AA and NA, I believe these organizations don’t permit the use of marijuana for members. That said, they’re decentralized support networks that vary from chapter to chapter so what may be ok for one group may not fly in another. I think if someone has made the decision to try a 12 step program, it is in their best interest to attempt the version of sobriety and recovery that is offered by it. It doesn’t work for everyone though and if pot is necessary to ensure the long term avoidance of other harmful substances, by all means. Do your thing.
When I was a kid, I went to NA meetings with my dad sometimes and almost almost all of the members smoked and drank coffee. Social stigma is a big part of what makes addiction life destroying and as time has gone on, pot has come to be viewed more like beer or tobacco instead of meth and heroin. I wouldn’t be surprised to find that weed has become more integrated into people’s lives as they move away from harder substances during recovery.
One last caveat: weed can just as easily hamper someone’s recovery as it can help it. I’ve had friends and family relapse after smoking because they thought it would be ok. All it did was make them crave their substance of choice more. Weed isn’t some miracle cure for recovery from hard substances, it seems like more of a coin flip whether it will help you or harm you in the long run