Friend here works at our regional airport, baggage handling, refuelling, marshalling, monitoring the start-up etc. lots of exposure to Jet A 1 fumes from the turbine aircraft that fly in.
Couple of years ago he was diagnosed with something akin to leukeamia, and has since had radiation treatment - with all that entails - and then a complete blood replacement procedure, and thankfully seems to be recovering. The suggestion was that this was a direct result of breathing jet exhaust - that macho smell that we love so much !
There is no doubt that the orgaphosphates in some sheep dips cause serious health problems.
A sheep farmer friend suffered identical symptoms around the same time.
Not saying anything, just reporting the facts.