Arizona gets heavy spray although they may be doing different Pathogens/Chemicals at different times. I'm wondering if the Silicone is a fairly new "experiment". Also remember now they are spraying worldwide, some places more than others. Keep a watch in your skies!
I don't feel hits with everything I run, but with most. I always feel a hit with whatever Newport dowses for me though.
A hit to me feels mostly like dizziness, pulling, pressure, pain, ache, mostly in problem areas and not always all but any one or combination of the above.