I've given up for 1 or 2 years at a time, 3 or 4 times now.
When I was a mature student, I only drank alcohol when I went home for the hols. That was because I'd drunk away any chance of getting a degree first time round, and didn't want to mess up my second attempt.
I'm currently 6 months into another alco-break. I can't really spare the money anyway, but the main reason is that I don't think that it would be a good idea while still suffering my well-documented health problems. Losing weight is a very pleasing side effect of my abstinence.
I hope that one day I will be well enough and solvent enough again to be able to enjoy one or two evenings a week where I drink a few pints, a maximum of 4 or 5, say. If it doesn't happen, fair enough - I'll carry on as I am.