Diet Soda???

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Broke down and bought a Diet Mountain Dew today. I haven't had caffeine like this in nearly a year...but between the first week of school and work, I was in desperate need of a pick-me-up! If you see me running around like a rabid squirrel--its the caffeine LOL. I'm hoping I don't get addicted to the energy! How do you guys feel about diet soda? I am typically a water-only-person. Do you drink diet sodas very much?