I've been trying to find out how racial groups differ in their sense of smell. Anosmia is lack of smell, hyposmia an underdeveloped sense. Nothing leaps out at me from googling around, or looking through books on olfaction.
There are cross-cultural Smell Identification Tests, but they seem to give conflicting stories about which groups have a better overall sense of smell, i.e. if you tested every odor possible, and not only those that one group has lots of experience with and other groups little.
But, I haven't devoted research-project time to sifting through everything here. Anyone who wants to find out and broadcast something exciting and new in the world of human biodiversity should look into it and write it up.
I have this vague hunch that modernizing is causing us to lose our sense of smell, as part of the broader pattern toward becoming more cerebral and less corporeal. I also get the impression that pastoralists are more likely to wear cologne and perfume, suggesting they have a more developed sense of smell than folks in agrarian societies. Then again they may have the same olfactory sensitivity, but just more of a flair for living.
Any anecdotes you guys have, or patterns that are well known but little talked about?