To add to this, I agree with most of these posts. I probably drink to excess far above guidelines, but having known alcoholics, I think I am fine, as I frequently quit for a few days whenever I see the need. When you migrate from beer to vodka, then you know you have a problem.
And the need for me to quit, is that alcohol affects my joints and stoves me up. And it constipates me. Not sure why. Give it up for a couple of days, I am find....but then....HERE COME THE WEEKEND! (Cue up Dave Edmonds).