I'll try to briefly answer your question.
With respect to the cancer question you asked, I think it's important to recognize that our whole world is made up of chemicals. All the things we eat, we touch, and we breathe are chemicals, most of which are natural. For example, there are 17 carcinogens in a cup of coffee. Again, it's not the chemical, it's the dose that we need to take into consideration.
With respect to the comments that you raised, the statistics we have from the Canadian Cancer Society--