Well, one of my favorite smells doesn't involve flowers, food, etc. My favorite smell is something completely different. It's completely odd and a combination of two different things. Let me explain:
You know the smell of freshly cut grass?
Have you ever opened the door to an air conditioned house and the cool air hits you really hard?
Combine those two smells.
That is my favorite smell. It reminds me of fun times when I was younger, it reminds me of home, and it is just a lovely smell.
What's your favorite smell?