In a scene in the episode Improbable CauseImprobable Cause, Odo is questioning an assassin posing as a perfume seller, and during the questioning asks the assassin to describe the fragrances of some of his wares, claiming that he himself (Odo) doesn't have a sense of smell- was Odo lying about this (he obviously can see and hear in humanoid form, maybe he can smell too)?