Obesity. Check out the increase in cancer risk for uterine and other cancers that results from obesity. .
Lack of physical activity is another. Colon cancer risk is higher for sedentary lifestyles. Much progress could be made if the issues of obesity, smoking, and lack of physical activity were addressed. All of those risk factors are controllable. .
Sending little kids up the chimney to clean it. Take a look at the history of what happened with cancer during the child labor days. This cancer risk is related to the smoked foods that was mentioned earlier. Combustion products can be carcinogenic. .
I think monkeys passed on cancer much like Aids. Kill all the monkeys...kill all the people with cancer. Problem solved. I've found the cure for cancer, folks.