Superhuman Senses (smell) – The person has enhanced smell.
Superman (DC) smells a trick in Lois Lane V1 #39.
Krypto (DC) has a much better sense of smell than Superman and can smell an imposter in Superman V1 #137.
Superman uses Krypto (DC) to track down Poison Ivy in Batman V1 #612. This is after Superman admits he needs the help of Krypto.
Daredevil (Marvel) uses his super senses to compensate for being blind. In Daredevil #32, the reader finds out that superhuman smell has a downside.
Wolverine (Marvel) uses his sense of smell to track enemies and sniff out shape shifters.
Dragon Man (Marvel) is used to hunt Spider-Man using his scent by the Wizard in Web of Spider-Man V1 #61.
Fin Fang Foom (Marvel) finds a baby dragon using scent in Drax V2 #11.
Lobo (DC) can apparently smell crazy in Annual Injustice – Gods among Us #1.