sb sfo,
Maybe I should have said the risks are minimal rather than it is a minor issue, for this I apologise because it is a major issue when it happens, and I'm sure a "snootful of hot organophosphate" would not feel minor.
But an average passenger, lets say, taking 2 return flights of around 2-3 hours each year then yes I believe the "risk" will be low and as suggested in my post, the more frequently an individual flies then the risk of exposure to fumes that may or may not contain hazardous levels of tricresyl phosphate will also increase. I am not saying that toxic fumes are not present and serious fume events do not take place, or that when they occur they are not serious but I do believe that for the average passenger they are rare.