Mine will sniff anything I eat, and anything I might drop on the floor, but has never actually proceeded to eat any of it.
If she looks very interested and it's safe for her to try (I eat a lot of garlic lol, which isn't), I'll give her a crumb, but she'll mostly sniff a bit more then leave it. The only thing of mine so far I've found she actually does eat and asks for more is doughnuts, which I only give her a tiny crumb of every now and then..