Our daughter is also 2 (almost 26 months) and is big time into smells as well. We drive past big trucks and she always tells me they smell like exhaust. Today in the mall she asked me what the smell was...it was the soap store. When something is cooking she has to know what it is.

Dd also has a very heightened sense of sound...I wonder if the 2 go together at all?

I also have a strong sense of smell and so does my mom. Maybe it is genetic? Sometimes smells will wake me up. I can smell the "Rubbermaid" aisle at Walmart from a couple aisles away...weird i know. I also can't stand the smell of Zip-Lock bags. Yes, they do have a smell!

It's an interesting topic though!