Disability discrimination

I'm bad at olfaction. Which is a complicated way of saying that i have a quite bad sense of smell. It's most obvious when something stinks: people start to wince and only after a minute i say "yeah, there's a hint of daisies in the air". It's a good thing and a bad thing. Good thing is i can't be easily bothered with bad smells. Bad thing is - i might die in a fire accident, since i won't sniff the smoke fast enough. Which makes me sort of a disabled person: i'm limited in some way. So the question is, why there are no invalidity group for people with olfaction problems, as there are for people with hearing or seeing problems?