That's the million dollar question. MANY people here on SR believe sober means 100% from everything. Some believe nicotine and caffeine are questionable. Many sober people use prescribed narcs. slippery slippery
When I quit drinking, I did so because after x amount of beers, I am not in control of my decisions. Because I don't know how many x is, I don't drink at all because I refuse to give up my decision making power. So I guess I am not sober, I am just abstaining from alcohol because although I have not done any other substance since I quit (besides copious amounts of caffeine), it has nothing to do with me quitting drinking.