I believe I am in that same boat and never realized the connection. It is 4 weeks today as a non smoker. I have restarted my atkins and have not lost anything to speak of. I was really kind of worried that I was watching my carbs and still gaining, so this is kind of a relief that it is my metabolism. Thanks for all this info. I will continue with my atkins and will do everything I can to rev it up. Again thanks for turning the light on!