[ModelBreaker]

Well, epidemilogical studies are not the type of controlled experiment that would establish causation. But they are hardly pseudoscience.

[Wooly]

Too many people think that cancer is a disease that you catch and if you just eat this food, take this vitamin, detox your colon or follow some other popular guru. Reality is that for most cancers you are born with a flaw in your DNA that at some point in time causes the reproduction of cells to mutate. Very few cancers seem to be caused from outside reasons alone, such as Lung cancer or skin cancer.
And before you decide that I am full of it, I am undergoing treatment for prostate cancer and my oncologist when ask if there was anything I could have done to prevent this told me that it is almost always hereditary.