my o/h died of colon cancer and i honestly believe it was his lifestyle that caught up with him, ate too much, red meat especially, did smoke once upon a time, and did like a drink.
my mum had bowel cancer and was given the news of remission some time after the op, she hardly drank, stopped smoking years before but eventually succumbed to lung cancer. It beats me who gets it and why but 1 in 3 or less will get cancer at some stage in their life.