100 % of people who eat a fast food hamburger also die. Interview people who are dying and they most likely had a hamburger during their lifetime. Did the hamburger kill them? Damned if I or anyone else knows for sure. Same with cigs.
Pretty sure there is evidence that smoking causes cancer while it might be hard to find the same on hamburgers. I see the point you are trying to make, though. Let's all make money off the smokers. Works like a charm!