When I sharpen a wood pencil, I always smell the tip.
I lived in MS, so I liked when it would rain on 100 degree days and you could see the steam come up and it smelled so great. I guess it's more of a nostalgic thing though.
A&F cologne. When you go into the stores in New York, it's like you were freshly sprayed, but it's just permeating through your clothes haha.
I also like the smell when I gave my kitten a bath, he would smell so squeaky clean.