[Great Dane]

95% of all lung cancers are caused by smoking. No smoking, no lung cancers.

I am not sure I trust those numbers, there are 5 kinds of lung cancer, only one of them caused by smoking.

[Gabz]

.......there are 5 kinds of lung cancer, only one of them caused by smoking.

And with that one, I believe there is only a strong linkage.

[TwoBear]

There may be 5 types but the majority are of the type that are known to cause lung cancer. Metastatic lung cancer is not lung cancer per se and thus isn't a consideration here. Someone else stated that 80% of lung cancers are found in smokers not 95%. That is a totally different statement. Of all lung cancers, 95% of total number are from people that are genetically predisposed to develop lung cancers if they smoke.

Let me tell you how it occurs. The branches of your lungs are lined with small finger like projections called cilia that are constantly moving inhaled particles back out of the lungs. On inhalation of cigarette smoke paralyzes these cilia for five minutes. Continued smoking for years damages these cilia and allows carcinogenic particles to remain in the lungs instead of being removed.

I work in the oncology field and treat lung and many other lung cancers daily.