Ok, if it’s just particles how does it distinguish the particles on a molecular level. This is important shit. The closest science can do is gas chromatography and that’s an instrument which exists in any reputable lab. Also, using gas chromatography for this a far cry from the simple function of our sense of smell which can distinguish scents just by simply introducing a fragrence.
I believe the receptor cell responds to a particular part of the molecule in question. Artificial flavourings and scents have identical (or similar enough) parts to trigger the same response, but are otherwise different molecules.
Maybe I’m misreading your tone, but I’m not trying to argue with you - I’m genuinely curious about this and if you have superior knowledge I’m open!
My understanding from a quick skim of Wikipedia citations suggests we understand what’s involved (particles and receptors) but the actual mechanism around encoding of signals seems to be theory.
We also can’t teach a computer to think, but we still have quite a good idea of how it works.
https://pca.st/episode/835428d6-e13b-4f1b-866c-de9b6a74d660
If your interested this is a good episode of Unexplainable. They can do better then me.