Baywatcher,
you forget the 'supreme' quality of the air that you are quaffing down when onboard. All those petroleum/plastic based chemicals in the seats/carpet/furnishings, all the limonene/citrus used to clean a/c components, the oil from the engines and APU......oh and the food!
But, joking aside - pilots and cabin crew are exposed to a lot of things that a person in an office, or a nightshift worker in a warehouse is exposed to - not just the odd working hours.
All these factors will increase your risk of getting some disease with a long name - good genes or not.
Your (continued) Good Health,
N1 Vibes