Charm,
Although I respect your opinion, might I suggest you give "Anticancer - A New Way of Life" by Dr David Servan-Schriber, MD, PhD a read.
This book has come up at a number of presentations I have attended from my OC support group, Scripps Institute, Sharp Foundation, Kaiser, and the like
The book references a lot of interesting studies that are available and well documented in reputable journals(such as the New England Journal of Medicine).
The book is several years old, but at a recently presentation the presenter (I believe she was with the Salk Institute) said it is still worth a serious read even though some of the material is now outdated.
It is the author's position that we can learn to protect ourselves from about 85% of cancer and he uses "Identical Twin" studies "Denmark's Adopted {3rd World} Children" studies and the like to build his case for conclusions that about 85% of cancer is likely due to environmental/nutritional factors.
I believe this book, like most, refects the author's bias, but it is pretty good brain food and the referenced studies do raise questions.