I've noticed it to some extent, although I'm not sure how much of it is that I typically feel good now, so I notice problems much more, and how much of it is actual increased sensitivity. I suspect it's some of both.
Alcohol, certain inhalants (e.g. paint or chemical fumes), and medications affect me much more strongly now, particularly if I'm in ketosis. Perhaps it has something to do with how hard your kidneys are already working, and how fast things are cleared from your system?
On the plus side, my seasonal allergies and certain skin sensitivities are nearly non-existent compared to pre-paleo WOE.