I believe, JMO, that stress factors into the onset of this disease. Have had many friends and family who have had cancer and usually the onset seems to be precluded by some stressful or very trying time in their lives.
Try to keep it positive and easy going though as even if it is not the cause of cancer, it does a body no good.
Nowadays it's hard to know. Every few days it seems there is a new study saying everything from the air to the food we eat "could" be a factor in causing cancer. You know,

, it just gets confusing and you'll end up being afraid to eat, breath, sleep with blankets, go to the mall, etc etc if you listen to them all. Moderation in everything. Eventually we all have to go anyway and we're not going to like it but to live life paranoid isn't really living life is it?