I bet if you ate asbestos continually it would probably irritate the lining of your colon and increase the likelihood of IBS or Colon Cancer. Everything can and will kill you at some level.
Sounds complicated, and even if I did start chewing on brake pads (my only available source of asbestos) then my findings would be limited to n=1 which can be ignored or relegated to anecdote.
Well, that's never actually been proven so you can make a name for yourself by investigating this topic, if you feel so inclined.