A lot of the reason shit smells like it does has to do with aerosol chemistry, which isn't in particulate form.
Your theory fails.
Here's a small sample of some of the chemistry in question:
Acetic acid (vinegar)
Butyric Acid (rancid butter)
Propionic acid (sweat)
Valeric [Pentanoic] acid (smelly cheese)
Pyrrole (fishy)
Pyridene (fishy)
Hydrogen sulfide (rotten eggs)
Methyl mercaptane (skunk)
Indole (flowery/classic fecal smell)
Skatole (rotting, putrid)
Ammonia
Trimethylamine (fishy/ammonia)
Have a shitty day.