I'm totally a newbie but ill still chime in.
1. Smiling at someone will more than likely provoke them to introduce themselves to you.
2. When they ask for newcomers, raise your hand, say I'm (leslie in my case) and I'm an alcoholic (and/or addict)
3. Don't scram out of the door when the meeting is over (as I used to), go get some literature and linger a bit.
All the best