Well good for you for not ...drinking out of control?... for 4 years? Hehe. Seriously, if that is your goal now, then congrats. Your post confuses me, though! You know that AA is a program of total abstinance. Right??
So here's where I'm confused. "As an occasional drinker I felt like picking up a chip for not doing dope for 4 years would be against the program's policy of no mood-altering substances of any kind."
Alcoholics Anonymous has no explicit policy pertaining to mood-altering substances, especially if prescribed. However, Alcoholics Anonymous is an abstinance-based program in which members pick up chips for various periods to celebrate those periods of time without consuming alcohol.
So... You'll have to color me "stupid" this time. lol I guess I am confused as to what exactly you have been thinking AA is all about.