Exactly! I can cite 5+ women here in Poland who I know that all have thyroid related issues. Not blood related to each other but born close to each other. As far as I can tell no one is humping their cousin...
My mum died when she was 36 because she had spent a couple of years working in a battery production factory in LT. I remember visiting her too! The amount of cancer, the locations of it and the aggressiveness of the growths found in her pointed to the simple fact that she was exposed to incredibly harsh chemicals. But it could be blamed on X, Y, Z if need be but this is the reality of it.
Cousin marriages and cancer? Wow.