Loophole: This could mean you lose smelling as a sense. Not that you are immune to these smells, just all of them.
jonnyt_
It makes a difference if its clumping litter. Clumping litter you could just choke down the clumps without tasting them. But non-clumping you'd have to taste more cat pee.
whargolflorp
its says you never have to. this could mean you never encounter a situation where you would smell these things.