Maybe you don't. But that ignorance shouldn't be paraded in a public forum. It hurts your side of the debate.
Ever hear of smoking causing lung cancer? How about HPV causing cervical cancer? Or Hep B causing liver cancer? What about radiation causing thyroid cancer? Chewing tobacco causing lip/mouth/throat cancer? DES causing breast cancer? Radon gas causing lung cancer? These are off the top of my head. Should I continue?
Oh, come on. I clearly stated that we do know that smoking appears to help cause (lung)cancer. You are talking about TOXINS, not a medical procedure here. Thats my problem with your claims. You are comparing apples and oranges. It would be more true to say, based on your claims, that simply not having children increases chances of breast cancer. I want to see studies conducted before industrialization, before "21st century technology". I want to know if women not having children, before the days of modern junk food and polution experienced the same.