Sara,
i did many control-experiments. i couldn't.
though it looked to me like of course i could: i mean, if i can go for a week without, clearly i'm in control, right?
just as you're thinking
but i couldn't, never wanted just one drink, and ended up drinking over and over when i had intended and committed NOT to.
and i was a secret drink-at-home-alone-drunk, too. couldn't imagine who or how i'd be without it...but here i am, years after quitting, still finding out.