Fellow non-smoker
Same thing happened to me - quit smoking after 20 yrs and BANG....hypothyroidism! I work in a medical lab and have watched my thyroid hormome levels for years - always well within the normal - remove the nicotine stimulant, and look what happened. My doctor theorizes that the nicotine was supplementing the TSH function and acting to stimulate the Thyroxine production although I have not been able to find any medical literature to support his theory. Face it, in the big picture, it beats lung cancer.