[Ruma]

Check out some more:
http://www.hec.ohio-state.edu/bitf/e..._addiction.htm
http://www.hhp.ufl.edu/faculty/pbird...E/EXADDICT.HTM
http://www.active.com/story.cfm?stor...tegory=running

I have been there. Not very severe though. But it was there. I have jogged in rain, in snow, in dust outdoors.. in the absence of a decent gym. So it is not a myth.