i know i am sensetive to the mercury Amalgams in my teeth because of how my tongue has been permanently affected, (geographic tongue) and all the other nagging symptoms.
Geographic tongue is believed to be an auto immune disease. Smoking is very bad for it. Two years after amalgamectomy I still have mine. My uncle worked on the LEM, Lunar Excursion Module in the 60's (electronics field)and he got liver cancer.