see alcohol thread in womens only section
You might look at an older thread concerning alcohol consumption and dieting. You may have to go to page 2 to find it, but there were a lot of very thoughtful posts about the ins and outs and the difficulty in giving it up for many of us who were used to 2 or 3 drinks a night. The general consensus is that while not very many of us were willing to give it up altogether, most of us had cut way back and reserved alcohol consumption for either special occassions, dining out, or a weekend indulgence.
As with many things, if you can find something to substitute the activities surrounding vodka, such as not going to happy hours (not that you necessarily do) or not sitting in front of the TV for hours with a glass in your hand (again, not that you do), then you are likely to be more successful.
At 22, now is a great time to start establishing those GOOD habits that will last a lifetime.