Speak with the fact smoking and lung cancer

Speak with the fact, smoking and lung cancer
Whether there are relations while finding out lung cancer and smoking, one very important method to want, count, appear person that smoke and smoke what does it have each among the suffering from lung cancer person too fast, how much and there is no person smoking and not smoking among the persons suffering from lung cancer to each have. 1948, that has observed 649 men and 60 woman's lung cancer death patients and the same quantity is not the smoking and getting used to of death patients of cancer in Dole and Hill hospital from London, except other possible influence factors side by side. Proportions of smoking of persons who reveal of their result of study, it is not the tumour death that the proportion of smoking in the death patient of lung cancer is obviously higher than; Serious a smoker ' Above every day No. 25 Branch) The possibility to suffer from lung cancer is 50 times of the non-smoker's. This suggestion, smoking may be a dangerous factor of lung cancer.
In order to further prove this question, Dole and Hill have carried on the 40 - year long follow-up study to 34439 men doctor and 619 women doctors since 1951. After a while every, Dole and Hill investigate to these doctors once, record their habits and customs, situation and health status of smoking. This investigation is until now still going on. Find, the smoker's total mortality is 2 times of the non-smoker's after tracking 40 years, and the mortality of suffering from lung cancer is 20 times of the non-smoker's. In 1993, probably 20,000 doctors polled originally passed away, 883 people among them died of lung cancer. Smoke them quantity and lung cancer have illness coming on situation link up, can draw one surprising conclusion, the probability that the person who smokes more than of 25 cigarettes gets lung cancer is 25 times higher than that of the person not smoking every day.
As people endanger the intensification knowing in smoking, accuse of the smoke and work and launch in all parts of the world successively. In some country, launch accusing of cigarette work effective for a long time, smoking rate begins to drop, thereupon the mortality of lung cancer begins to drop too. In the sixties of the 20th century, American per person consumed and peaked tobacco, the per person tobacco was consumed and begun to drop after the seventies. But the appearances of diseases related to tobacco such as lung cancer,etc. will delay 20~30 years. So, the peak of American lung cancer mortality appears in the 80s and 90s of last century, the mortality of lung cancer does not begin to drop until this century.
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