What is it like to snort sugar? What happens?

They aren't broken down by the stomach, so it's a great way to get into the system.” But the human nose is not designed to snort powder. Snorting powder of any kind can lead to inflammation of the nasal lining, infection in the lungs and blockages of respiratory tracts and nasal airways.

why would you do that?

You will become congested, basically making your snot more sticky making it harder to come out if you blow your nose.

Damage to the nasal passages, probably not much else.