Nobody knows what actually causes many cancers, possibly viruses, bacteria or chemical exposure, but we can certainly gather evidence to come to an idea, in fact if 50% of lung cancer patients were smokers, while only 20% of the population smokes, is that evidence to you? The truth is studies like this are important to help discover cures or to prevent cancer from even occuring. I realize many freepers are tepid against these things, calling the studies flawed, funded by anti-smoking nazis etc..but to say that smoking is safe or whatever is simple silliness, like I said I am a smoker, who comes from a smoker who died of lung cancer, I know the difference my body has shown from before I smoked to what it is now, there is a difference. Sure some people are genetically predisposed to cancer, but sometimes that predisposal needs a catalyst and smoking for some is that catalyst.
If only that were true. A simple example is cervical cancer. More than 95% of cervical cancer is caused by a sexually transmitted virus, HPV. Yet, the agenda-driven still claim smoking is the number 1 cause of cervical cancer. Instead of seaking a cure, or education on prevention, they continue to blame smoking for something they have already proven is NOT caused by smoking.
I don't claim smoking is a harmless habit, let alone a healthy one, but it is sure as heck not the cause of nearly every ailment known to mankind as claimed by the anti-smoker paid professionals.
More like 85% of lung cancers in the 25% of the population which smokes.