This position study summarizes the overwhelming evidence that smoking is the cause of Lunglung cancer. Smoking has been identified as a major risk factor for various cancers, including cancers of the lung. Lung cancer is the most common form of cancer caused by smoking. To test the study, we used a chi-square test,and. The target population of this study, was people with lung cancer in Tripoli and the link to smoking with the disease.in over a period of 4 years.