I gave up my Mtn. Dew addiction (6 or more cans a DAY) about 5-6 years ago. I just stopped...cold turkey! It was hard at first, but I didn't have a very difficult time w/ it...now, I can't even have a sip of a "soda" without it making my sick at my stomach (I accidentally grabbed my daughters cup one day and it had her coke in it, it was NASTY)!
I didn't loose ANY weight when I quite. I wasn't really looking to, but that would have been a plus....I had people telling me they lost anywhere from 5-10 pounds, just by not drinking a "soda". Well, that wasn't true in my case!