Congrats so far. I quit drinking a lot of soda because it gave me heartburn. I was drinking 4-5 cans a day sometimes. I had quit drinking Mt. Dew because it contains brominated vegetable oil. Mt. Dew is one of the only sodas left on the market to contain it. In larger amounts it can cause some nasty health issues.
I still drink soda, but its very few and far between. I'm lucky if I have 1 a week now. I wish you much success on quitting. It helped me a lot!