My friend C.S. had bladder cancer last year. They did surgery and got it all. But now it's back. 50% of cases are caused by smoking according to the American Cancer Society. This is the same friend who smokes and refuses to entertain any thoughts about ever stopping. He says he loves it. I think he's just addicted. He says he doesn't care if he dies because he won't know he's dead. So yeah the cancer is back and I'm sure he smoked like a chimney as he does every single day- 2 packs per day! But can I say anything to him? No! He would make excuses and likely even get angry with me.