Nevertheless, it's not quite as clean as the scent of light.
Gravity smells like nose-mucus.
You know, boogers. It smells like alcohol. The more alcohol one drinks, the more one tends to fall down. Therefore alcohol must be gravity. They were tired of having to track people through through three dimensional euclidian space, so they went to the beginning of time and released gravity, undetectable in any way, let alone by olfatory senses.