Coca Cola Addict?

I've been giving my habits some thoughts lately and I've concluded that I'm drinking a shit load of carbonated sodas, mainly Coca Cola.
Is this an addiction or just a bad habit? Would I be able to stop if I wanted to? These were some of my last thought before I fell to sleep last night.
So I've decided to give it a try. Just to see how long I can go and if it'll have any healthy effects.
My only concern is how I'm going to do when I'm out drinking with my friends, as my favorite drinks contain sodas.
Should I exclude the rule from partying or just go beers all the way.
I'll be giving that last one some more thought, but starting now, no more coke (or any other carbonated sodas). How long can I go? :S