That sucks but I wouldn't beat myself up over a diagnosis over something like that. It's largely genetic.

My dad is a Vietnam vet in his 70s who drinks, smokes, and has way too much coffee. And he's fought 2 tours in Vietnam, 3 bouts of cancer, and a whole other host of issues.

Some people can't be killed. Others get cancer in their 20s. You do the best that you can and try not to beat yourself up if you get an unlucky draw.