There is now a cadmium link to breast cancer. I am not sure I remember eating cadmium. I know there is a cadmium in some paints - remember 'Cadmium Red' crayons? Cadmium is in lipsticks and other paints. Or maybe it was in lipsticks and paints that you aren't supposed get from China and other overseas factories. I know there are all sorts of heavy metals including cadmium in polluted ground from old factories. I don't remember having much intake of cadmium in my life.
I don't think that they, the proverbial they again, really know that much after all. Its another guess.... Sooner or later they'll get it right. I hope.