unfortunately it would probably be a catch 22 situation. a cancer vaccine would lead to an increase in stroke and heart attacks. a CURE for cancer, would be a great, amazing discovery. but a vaccine would most likely just empower more people to live an unhealthy life style with no fear of cancer. but the body dousnt operate that black and white. everything is connected and what may cause cancer also causes clogged arteries, obesity, diabetes, etc...
dont get me wrong here, it would be a great discovery, but people push the limits of everything, its our nature, set the speed limit at 55 we will do 70, etc.. take away one fear and we will just indulge more in reckless behaviors.....human nature for the pursuit of pleasure and self medicating in whatever our choice of habit......