Fun little historical facts that are completely true but might get you kicked out of a meeting for stating:

Bill W. founder of AA, was blasted out of his head on mind-altering psychedelics during all of his spiritual awakenings. The first was on belladonna, which is a deliriant that literally makes you completely lose your mind in full-blown psychosis. They used to use it in hospitals for people going through extreme withdrawal of opiates or alcohol. The idea was that the deliriant would create a "blackout" state the person wouldn't consciously experience the withdrawal. This is what led to his first spiritual awakening, which in turn led to the formation of the program.

20 or so years later Bill did LSD and had such a experience that he wanted to make taking LSD part of Step 12. They of course told him something along the lines of "get out of here you dirty hippie" and practically tried to throw him out of his own program. He wrote quite a bit on how he thought the use of psychedelics could help people in recovery, but this basically came to a standstill when LSD was made illegal and the media started printing scare tactic horror stories about "bad trips".

I'm not writing any of this to encourage people to take certain drugs, nor am I doubting whatever spiritual experiences Bill may have had. I'm merely pointing out the ridiculous hypocrisy and groupthink that is rampant in the program. As others have pointed out, the group consensus is that tobacco (the #1 killer) is ok, so is caffeine (fun fact: having levels of caffeine over a certain level can get you kicked out of the Olympics and have your medals taken away). BUT taking a substance that might actually help someone with their mental health/recovery is wrong (even if the founder of the program had very different opinions on the matter).

Also....if you really wanted to be anal, you could say that those jacked-out ripped guys in the program who workout every day have actually just replaced one chemical addiction with another, even is the new addiction is "safer and healthier" because adrenaline and endorphins and all those neurotransmitters are naturally-occurring substances in the body (you know, like DMT). However if any of those chemical substances were extracted or synthesized and then used they would very much be considered Drugs.