I find this discussion interesting. If someone was going to get sick from too many x rays, it would be me! I've had countless chest x rays because I had tons of upper respiratory infections, asthma, etc. in my 20's-40's. I had a cyst in my breast when I was 32. So I got my first mammo then, the next at 35, then at 40. After that, every year. In the last year I've had 3 CT scans. And, I do have dental x rays every year...
I have no family history of bc and quite frankly, I worry more about heart disease. I wish women would pay more attention to that, since the risk factors are mostly life style things that we all have control over... I'm not a doctor, but maybe those same life style things are also part of why so many of us get cancer? I'm not saying that riding a bike or eating right is going to stop all cancer, but, it just seems like a lot of people don't want to take responsibility for their bodies. OK, off of my soapbox because it's not exactly on topic.

And I know exactly what you mean by the bandwagon effect.