Cats should not really eat anything but meat, they are obligate carnivores, even though they technically CAN eat other stuff. A cheese puff won't kill them, and they like everything cheese it seems.

Can my cat have a Cheeto?

Technically, Cheetos aren't toxic or poisonous to cats. But as they're also high in fat and sodium, they really have no place in a cat's regular diet. As always, you must ask your regular vet before sharing any human food with your beloved feline, including Cheetos.

Can too much cheese kill a cat?

It's not toxic to them, but it offers them no nutritional value. A steady diet of cheese would probably kill a cat, but the small occasional piece does no harm.