There by lies one of the problems, the route of ingestion.
Granted if you eat 70Kgs of the stuff( which is what the CAA are advocating) you probably will get Organophoshate Induced Delayed Neuropathy.
It is the Route to Hell where it is most dangerous,
which leads to Cronic Nuerotoxicity and that is the route of Inhalation; multiple low dose exposures which effects your system a lot quicker, producing a synergistic effect at altitude.
If you can smell it I'd say it was generally too late, you are already getting exposure.
Even CO is 50% more toxic at our cabin environment of 8000ft.
This is just the tip of the Iceberg I'm afraid.
Asbestos ? Cigarettes? Seem familiar?