Started impacting my area (SW Ohio) Monday. This morning, my naked-eye limiting magnitude was about 3.0 despite satellite images indicating clear skies. Normally, I'd expect an NELM of about 4.3, so I figure about 1.3 magnitude of extinction from the smoke. The moon was quite orange last evening as well.
AOD is 1.0 or higher based on satellite data.
(click on AOD on the drop down menu for GOES-16 data)
AOD is measured at 550-nm, while human night vision peak sensitivity is ~510-nm. A good rule of thumb for aerosol extinction is 1.2 x AOD, so ~1.2 mag of extinction / air mass would closely match your findings.
NOTE--this is the extinction per *airmass*. You look through 1.0 air masses straight overhead, 2.0 air masses at 30° altitude, and so on, up to ~40 air masses at the horizon. This is why the sun looks so dim and red near sunrise / sunset. Shorter wavelengths scatter much more than longer wavelengths, which is why the sky is no longer blue even though it's cloudless.