Good for you! I gave up soda... nine months ago? (I say this with a Coke Zero on my desk). But seriously, I cut way, way back. I used to drink more than a liter per day!
I drank soda for the caffeine, so I didn't think it would be a big deal to give up. I also drink tea and coffee. In fact, it was hard! I went cold turkey for four weeks. Three weeks into it, I would walk by a convenience store and it would take all of my willpower not to go in and get a soda. After 4 weeks, I allowed myself to drink them again, but with certain rules. Like, I can only get a soda if I am at the store to get something else, and I have to buy the smallest size available - no more chugging a two liter bottle.
I felt so much better after I gave up soda. I would get really bad headaches from the artificial sweetener and I felt completely drained and used up around 3pm every day. I always recommend people cut out soda.