Heightened Smell (3.5e Trait)
From D&D Wiki
You have extraordinary olfactory ability.
Prerequisite: Cannot have the Anosmia Trait.
Benefit: You gain the Scent extraordinary ability.
Drawback: You cannot stand strong smells. Any time you are exposed to powerful or bad smells you must make a DC 20 Fortitude save to avoid vomiting, leaving you nauseated for one round. If you succeed on this save, you are instead sickened for one round.
Special: If you ever become immune to the nauseated and sickened effects, you lose the benefit of the trait.
Roleplaying Ideas: The character may get tetchy when a team mate mentions something smells nice.