Ok, I'll take an aisle seat more often now instead of a window seat.
Unless you fly as often as pilots and other onboard staff, it's unlikely to be significant.
If flying were invented today, I bet it wouldn't be allowed due to the radiation. It's more than many medical procedures which guidelines say to only do when the medical benefits outweigh the radiation risk.
I suppose if flying were invented today the plane would have no windows and the pilots would use cameras.
Clearly the benefits of flying outweight the radiation risks, though.
Passengers flying now and then, it's not a big deal, but aircrews are at increased risk of cancer.