Back in the 90s when I visited AA and NA groups it was a no-no for the NA people to mention that they went to NA or that they abused anything but alcohol at an AA meeting. The drunks would cop an attitude or question the presence of a non-alcohol substance abuser. It was kind of funny and really sad at the same time. Drunks seem to feel superior to other types of drug addicts who are trying to recover and might be looking for a little extra support or whose schedule or transportation wouldn't let them find an NA meeting somewhere.