I'd like the know the answer to this, also.
When I quit c/t last year, one of the surest signs for me that I was getting past the worst of the physical w/d was when I visited a hospital and a grocery store one afternoon, and did not even need the jacket I had brought with me. My body was obviously beginning to be able to regulate its own temperature again.
I am off to look this up on Teh Googlez...