Might this be a basis of a better mass screening than temperature before entering somewhere? Hand a person a disposable card with a dozen circles on it and ask "which one smells like peppermint"?
I don't think it would be all that much of an improvement. Loss of smell/taste is a pretty good indicator of Covid, but still having smell/taste is not a good indicator of not having Covid.
My sense of smell has been not particularly great for many years - probably from some meth use as a teenager.
If covid gave me anosmia I doubt I'd even notice.
Excellent suggestion. I would use garlic rather than peppermint because an observer could judge their reaction rather than relying on a verbal response.