I do find it sad that a few tend to ignore the mountain of evidence to suggest that toxic chemicals reach the cabin from the very hot engine oil. Before we realised what it was I experienced the “sweaty socks” smell when closing the thrust levers on several 757s that I daily flew. Blood tests have confirmed raised levels of several of the oil ingredients and dna testing that I am not good at clearing toxins. This has resulted in very limited mobility, gastric problems and a heart attack, all acknowledged outcomes of inhaling the toxins. Incidentally several other crew flying those aircraft have experienced similar. There is now overwhelming evidence that aerotoxic syndrome is real, too late for some!