I imagine it is hard to measure that, since 1. It is a "wimpy" thing to admit to. People are reluctant to think things about themselves which, if admitted alou

I imagine it is hard to measure that, since 1. It is a "wimpy" thing to admit to. People are reluctant to think things about themselves which, if admitted aloud, could earn social ridicule. 2. One fear can prompt another and lead to an anxiety spiral which is too overwhelming for someone to even put into words. Conjecture: The best way to measure it would be to introduce a nasal spray and see what sort of uptick it earns.