It's been two weeks since I last had any soda (Coke, specifically) and last time it was just a 600mL bottle - compared to the fact that I quit cold turkey for about two months straight from drinking about 2L a day, I'm happy with that result.
I proved to myself that I can live without it, so now I'm proving to myself that I can live with it - without being an addict.
It's forgeted me up permanently though - my hands will probably never be steady enough to pursue hobby modelling again, due to the amount of caffeine I used to get daily. I also have trouble sleeping/waking up on time, although that can be solved with discipline.
I do however still drink coffee socially, and when I go out with my friends I usually drink whiskey and coke. My object was never to quit, just to cut back enough to be sane.