Re: "158 of which are Category 1"
As well as the effects mentioned by x 7, it's perhaps worth mentioning that current jet passenger aircraft have been known to get oil vapour in the fuselage due to the method of pressurisation. Given the sort of nasties you get in aviation fluids, it is at least possible that there are some problems which could get toxins in the pilot's air supply.
WW1 aircraft were lubricated with castor oil, with exposed valve gear, which meant pilots were liable to attacks of the shits from the oil mist blowing over them. This tended to get counteracted with whisky. Thus dogfights between two drunks made more cantankerous by intestinal problems.
Biting the hand that feeds IT
