Humans exhale all kinds of stuff aside from just CO2, including moisture and other metabolic byproducts depending on what you’re eating. Probably some bacterial metabolic products from our mouths too.
I guess I’m less into the semantic difference between “smell” and “detect” and more whether it’s the CO2 they’re following or something else we exhale regularly.
I guess I’m less into the semantic difference between “smell” and “detect” and more whether it’s the CO2 they’re following or something else we exhale regularly.