In the previous creatures, people are happy when they eat at all - a norn hunting food by smell would be WOW!!!!!!!
The only creatures who used smells for navigation are c3 creatures when they become home sick (sometimes)
Normaly the norns wanted something - they saw it - and then they walked in that direction - except there is way to much fear chemical in their body - then they walk away instead of towards it! (that's because of the genetical hard written walking)
Oh - and a lot of food (specially third party food) doesn't smell at all!
But could be different in previous creatures, cI'm only sure about c3