How much can a healthy lifestyle cut your risk of cancer?

A new study looks at how big a difference factors like diet, exercise, and not smoking may really make

From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.cbsnews.com%2Fnews%2Fhealthy-lifestyle-diet-exercise-reduce-risk-of-cancer%2F&key=ddaed8f51db7bb1330a6f6de768a69b8