What's that smell?

Here are a few of mine and Connor's conversations over the last week.

Driving over I-526 next to the paper mill (it always stinks there):
Connor: Mommy, what's that smell?
Me: It's the paper mill - see that big factory over there?
Connor: I smell poop! I smell Maggie poop!
(Maggie is my sister's dog)

Running this morning while pushing Connor in the jogging stroller:
Connor: Mommy, do you smell something?
Me: Yes, I smell fresh air and flowers. What do you smell?
Connor: I smell a sweaty mommy.

Driving to school this morning:
Connor: Peeyew, I smell something. Mommy, what's that smell?
Me: It smells like the exhaust from the car in front of us.
Connor: No...I smell macaroni and cheese.