There's really no way to tell.  You could be highly allergic to some
other animal and have no problems at all with ferrets.  If you think
you might be allergic, visit a pet store, breeder or friend who has
one and check.  Allergies might make you sneeze, or you might have a
skin reaction from touching or being scratched by a ferret.  One
person wrote me to say he was allergic only to intact males, so you
may want to try contact with females or neutered males as well.  Also
note that some people are allergic to the perfumes pet stores often
put on animals, but not to the animals themselves.