Found in 2 comments on Hacker News
AareyBaba · 2019-11-14 · Original thread
"The Secret of Scent" by Luca Turin [0] if I remember correctly goes into research that indicates that there may be quantum effects that explain how shape/chirality of molecules affect smell. [0]

So it is plausible that nature may have evolved to be affected by quantum effects.

lubujackson · 2013-03-31 · Original thread
Noses and how we detect fragrances is actually done on an atomic level, basically by testing the reverberation of the bonds between molecules. So when two things smell the same they actually have the same bond strength, but can be completely different chemically. This is why creating artificial scents is so hit or miss.

The science and discovery of all this is really fascinating, I recommend The Secret of Scent by Turin:

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