I eared that drinking whisky and smoking cigarets counteract the effect of radiations or at least if you get a cancer you won't know if it's due to cosmic radiations or alcool.
In fact and more seriously it will be allways difficult to know exactly the origin of a diseases unless you know all of the facts you'll be facing artefacts.
From my point of view anyway I would not be surprised that man hide us the truth. Like paludism is not considered as a professional sickness irradiation will probably never be either.
Enjoy your flights............and moreover your drinks at arrival
