Smoking and Lung Cancer

The high incidence of lung cancer is attributed to environmental factors, occupational exposure, smoking, home cooking, insufficient intake of green vegetables, chronic respiratory diseases and genetic factors. Smoking is still the most dangerous carcinogenic factor. As for the high incidence of lung cancer among non-smoking women in China, According to expert analysis, The city’s air pollution and previous history of lung diseases, It is the reason why they are not immune. The relationship between lung cancer and smoking is well known. Those who have smoked for more than 20 years, those who started smoking before the age of 20, and those who smoke more than 20 cigarettes a day (the so-called [320] population), As long as there is one, it is very easy to suffer from lung cancer. Among hundreds of millions of smokers in our country, female and minor smokers are on the rise year by year, which leads to an increase in the incidence of lung cancer among women and young and middle-aged people. It should be emphasized that heavy smokers are the high incidence group of lung cancer and non-smokers, and the probability of lung cancer among heavy smokers is 5.7 times higher than that of non-smokers.

So far, relevant research believes that the relationship between smoking and cancer mainly has the following 10 facts:

1. 30% of cancers can be attributed to smoking, especially lung cancer, laryngeal cancer, oral cancer, esophageal cancer, bladder cancer, pancreatic cancer and renal cancer. The most deadly are lung cancer and pancreatic cancer;

2. The incidence rate of lung cancer, laryngeal cancer, pancreatic cancer, bladder cancer, esophageal cancer and blood cancer in long-term smokers is 10-20 times higher than that in non-smokers, 6-10 times higher, 2-3 times higher, 3 times higher, 4-10 times higher, and 1.78 times higher than that in non-smokers.

3. If you smoke more than 25 cigarettes a day, 12% of the people will develop lung cancer.

4. Some women who live with smokers are 6 times more likely to suffer from lung cancer than ordinary people.

5. Among 1000 lung cancer patients admitted to Jiangsu Tumor Hospital, 80% were long-term smokers. The risk of female smokers is more serious, 1.9 times that of male smokers.

6. Smoking index (number of years of smoking x average number of cigarettes per day) exceeding 400 is a dangerous signal. For example, a young man who starts smoking at the age of 15 and smokes one pack a day may get lung cancer before he is 35-40 years old.

7. 90% of lung cancer in most countries in the world is caused by smoking, and 35 people in every 100,000 people in China suffer from lung cancer. The earlier the smoking starts, the higher the incidence and mortality rate of lung cancer. If the lung cancer mortality rate of non-smokers is set at 1.00, the mortality rate of smokers under 15 years old is 19.65, that of smokers between 20 and 24 years old is 10.08, and that of smokers over 25 years old is 4.08.

8. The relative risk of cervical cancer and ovarian cancer among smoking women is higher. The former is 4.4 times higher than non-smokers, while the latter is 2.8 times higher. The relative risk of cervical cancer among passive smokers in the family is 2.5 times higher than that of non-passive smokers.

9. Women who have smoked for more than 20 years have a 30% increased risk of breast cancer and those who have smoked for more than 30 years have a 60% increased risk. The onset of cancer among smokers is 8 years earlier than that among non-smokers.

10. After quitting smoking, smokers have undergone beneficial changes. Within 5 years, the mortality rate of lung cancer is lower than that of ordinary smokers (one pack per day) or close to that of non-smokers. The incidence rate of oral, respiratory and esophageal cancer has dropped to half of that of smokers. Within 10 years, precancerous cells have been replaced by healthy cells. The incidence rate of lung cancer after quitting smoking for more than 10 years has roughly dropped to the same level as that of non-smokers.

According to the World Health Organization, Of all the deaths from lung cancer, 85% to 90% can be attributed to smoking. Nearly 6 million people worldwide die from smoking and secondhand smoke every year. At present, the public is not fully aware of the health hazards caused by [secondhand smoke]. The survey confirmed that People who live with smokers for a long time have a 25% increased risk of lung cancer, and long-term forced exposure to secondhand smoke also significantly increases the risk of lung cancer. The study also found that lung cancer caused by smoking is not sensitive to chemotherapy drugs, with the effective rate of chemotherapy being only 30% ~ 40%, and is not sensitive to molecular targeted drugs.