you have to remember that these glues and adhesives are toxic,
i mean really toxic,feet sweat a certain amount ,normally as the foot heats and cools it can allow the cemical to enter the body through the sweat glands.years ago as teenagers we did an experiment ,we put a clove of garlic in our football boots before a football match,after the match we had a very strong smell of garlic on our breath.some of us worse than others,so we were told.
i remember leaving two solid german shepards with their new owners who ran a garage repair shop,over a period of 7 yrs,one lasted 3yrs and the other 4yrs,they both got the big C in their paws,,every paw the same,we agreed that the black waste oil which was spilled on the garage floor down through the years was the culprit.there was no cure,each dog in turn,in its prime had to be destroyed.
so maybe a new pair of boots is in order,?

biff