Is it possible to become addicted?

To exercise? I bought an elliptical and am loving it, although it is kicking my butt. I will get on it, turn the tv to mtv or vh1, whomever has videos going, and close my eyes and just listen to the music as I get my butt kicked. Funny thing is, the music that is usually playing is not something that I would normally listen to while in the car, but for me to workout it seems to be just perfect. I find myself torturing myself throughout the day, but I just can't seem to stop. So, is it possible to become addicted to exercise? Apparently so, because I certaintly feel as if I am. Not that I am complaining, I am simply loving every minute of it. I just hope that it helps me lose more weight and tighten my butt area. :-)