This appears to have first been recognised as a problem in the 70's and the Grauniad carried this article in 2006
Toxic cockpit fumes that bring danger to the skies | Business | The Observer.
toffeez - I reckon this needs to be on a more widely-read forum than medical? By the time pilots start looking at that forum they tend to have some problems and it must surely be better to prevent them in the first place?
EDIT: I see also the thread you refer to is well down the page and refers to ground staff mainly.