In medicine|lang=en terms the difference between susceptible and smear
is that
susceptible is (medicine) especially sensitive, especially to a stimulus while
smear is (medicine) a pap smear.
As nouns the difference between susceptible and smear
is that
susceptible is (epidemiology) a person who is vulnerable to being infected by a certain disease while
smear is a mark made by smearing.
As an adjective susceptible
is likely to be affected by something.
As a verb smear is
to spread (a substance, especially one that colours or is dirty) across a surface by rubbing.