Gravity has a scent that is left to the imagination. There is no boundaries for your nasal passeges to smell the odorous scents of gravity. Gravity is the smell of the human mind taking over its thoughts to expand the human horizons.
Gravity smells like pure water, only a little less so.
I never really thought about this question before. Now that you bring it up, though, gravity smells like the inside of my refrigerator. Of course, I could be wrong. Well, it smells like falling and getting a jolt afterwards. Or getting hit in the head with someone's knee.