That sounds logical, John, but often cheaters cheat because they are running at the back..or the middle (You lap those guys too, right? )

And they cheat because they don't get the core of the issue, it's not just the car, it's the driver.
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This is my belief as well. That's not to say there aren't cheaters at the front, but it seems to be less so because the drivers gotz mo' skillz.

I didn't have any throat or respiratory problems, and the burning/watering eyes didn't start and build up gradually, it seems like it was almost instantly.

I know that it can't be healthy to breath whatever it is, but my concern is more safety than health related. And I don't recall a specific odor, although in a racecar I seem to be subjected to various odors during a race (oil, tires, brakes, coolant, exhaust, etc.). The fact that I didn't get a nauseated feeling leads me to believe is was not simply exhaust fumes or burning oil from a used-up motor.

Are there exotic fuels or additives that you guys suspect are being used?