I think sodas are pretty much a vice for me. I used to drink an obscene amount of Mountain Dew when I worked in television. I gave them up when I left TV news... I wanted to give up a lot of bad habits then.
I have let Dr. Pepper sneak into an almost daily routine for me, but it's no where near as bad as I had let the Dew get.
That's some bad rationalization happening there.
Oh well... This may be my last soda for a while.