Ask HN: Will smell based computing ever become a thing?

Do you mean the utilization of environmental gas sensors? Like O2, Co2, NO2, Methane, etc? [1] If so they are already used heavily in multiple industries.

[1] - https://www.industrialsafetyproducts.com/msa-10116928-altair...

Use cases - It can be used to diagnose Parkinson’s and other diseases before symptoms manifest.

Are we all forgetting the Smell-O-Scope?