I saw a mention of the olfactory sense suppression medication in Strange New Worlds, and it made me wonder when the earliest version of this concept was written.
I know T’Pol mentioned humans smelling badly in ENT, and I’m almost sure she was taking some kind of suppressant.
Beyond that I don’t recall any of the other shows outright stating the practice, but it seems so in line with Vulcans that it had to have been thought up earlier right?
answer is still the same, was first mentioned in Enterprise.