Surprisingly, 9/11 and terrorists don't worry my at all when it comes to flying. It is probably a bigger chance that I will be run over by a terrorist in the street than ending up on one of their flights, however, should health effects of flying worry me more?

Is radiation going to kill me?
I have been flying 2-300,000 flight miles every year for the last 5-6 years and it is not looking like it will diminish in the near term. If it is true that every 4 hours in the air is an equivalent of a chest x-ray that means I am getting 100 doses per year. Does anyone know if this worry has any merit? If I was doing a chest x-ray twice per week, I have a feeling my doctor would be worried about a law suit when I am beginning to mutate :-)