Lovely Aromas

Cooking kitchens smell good.  They just do.  Yesterday, I walked into a friend's house and it smelled like frying fish.  No, not old fish or fish that was fried yesterday, but fish that was being fried.  Mmm...  Over the course of 4 hours yesterday, Darling and I cooked pizza, popcorn, and pancakes (a "P" theme, clever - had it been intentional).  When I walked back into the kitchen late in the evening, the warm and comforting layers of aromas just made me happy.  What is it about inhaling aromas of edibles that makes me so happy?  Maybe I just like to eat?  Or is it that food represents nourishment that far surpasses sating physical hunger?