You may as well taste em if you're going that far. Here is how smell works. Microscopic particles fall away and make their way to you olfactory gland, where it's absorbed. That's a risk I'm not willing to take with random, crusty drawers. Same thing as finding half a smoke in a public butt can and deciding to smoke it. So gross! Remember that the next time you go to smell a fart. You can smell it because Microscopic shit particles made their way up your nose.