terrible! Does haze and lung cancer really have a legendary “seven-year contract”?

Some time ago, there was a “seven-year agreement” between haze and lung cancer, that is, after the year of severe haze, there will be a high incidence period of lung cancer after seven years As soon as my blog appeared, it immediately aroused great attention on the 1nternet. The “seven-year agreement” on haze and lung cancer has become the focus of attention, and the impact of air pollution on human health is more worrying

does haze and lung cancer really have a legendary “seven-year appointment”? What is the scientific basis for such a statement

as for the main factors inducing lung cancer, a large number of studies have shown that smoking is the “culprit”, including second-hand smoke. However, according to the statistics of the health sector, there has been no significant change in Chinese smoking in the past 40 years, but the incidence rate of lung cancer has increased significantly. Many netizens questioned that the incidence rate of lung cancer is increasing without changing the level of smoking.

Zhong Nanshan, academician of Chinese Academy of engineering, pointed out in an interview with CCTV news 1 + 1 that “haze not only affects the inhalation system, but also affects the cardiovascular system, cerebrovascular system and nervous system, but the inhalation system is the first to bear the brunt. 1n the past 10 years, lung cancer has increased by 60% in Beijing. 1t should be said that air pollution is a very important reason. Since 2004, pan Xiaochuan, Professor of Peking University Medical Department, has been monitoring the daily average concentration of PM2.5 in the air. He found that whenever the value increased, the number of emergency patients such as suction system in nearby hospitals would change significantly. Previous studies have shown that the growth of PM2.5 is positively correlated with the number of patients with emergency related diseases in hospitals. For patients with circulatory system diseases and respiratory system diseases, the emergency volume will increase by 0.5% to 1% for every 10 μ GM3 of PM2.5 added

like sandstorm, it belongs to PM10 level particles, which can be discharged from the body by sneezing, runny nose, coughing, etc. But PM2.5 particles, the human throat has been unable to block, it can all the way down to the alveoli. 1n particular, PM2.5 is like a carrier, carrying harmful substances such as nitrogen oxides, sulfates and viruses. These toxic particles staying in the alveoli will eventually affect our epithelial tissue, inactivate tumor suppressor genes and induce lung cancer< 1n fact, the international agency for research on cancer (1ARC) has given an answer to the question of whether PM2.5 causes cancer on October 17, 2013, the international agency for research on cancer (1ARC) held a meeting in Lyon, where PM2.5 was identified as a class 1 carcinogen (the definition of class 1 is a confirmed carcinogen for human beings). So far, in addition to cardiovascular disease and aspiration system disease, PM2.5 will increase the risk of lung cancer and bladder cancer although it has been confirmed that PM2.5 can increase the risk of lung cancer, there is no relevant research to confirm that there will be a high incidence of lung cancer after seven years ‘s “haze and lung cancer 7 years of agreement” first appeared in a media report on the incidence rate of lung cancer in Guangzhou. This report is drawn from the research findings of the 2009 Guangdong Provincial Meteorological Bureau Chief meteorological expert Wu Dui on the incidence rate of lung cancer in Guangzhou: after considering the 7 year lag period, the correlation between the mortality rate of lung cancer and haze concentration in Guangzhou is as high as 0.97. This means that today’s “toxic” air may not produce “fatal harm” until seven years later. After seven or eight years, the mortality rate of lung cancer increased, and the time lag relationship between the two was consistent however, in this report, the expert added that it was omitted by netizens: “however, we still hope that the study on the pathogenesis of lung cancer and the real reason for the increase of its mortality will be jointly completed by experts in smoking and epidemiology.” many experts have said that “the statement of haze and lung cancer” is exaggerated and inaccurate. Up to now, epidemiological investigation has not done a lot of in-depth direct research on it. “ the impact of PM2.5 on human body mainly depends on which toxic particles PM2.5 adsorbs in the atmosphere. 1f the adsorption is carcinogen, it has carcinogenicity. 1f the adsorption is heavy metal, it may cause heavy metal poisoning. Different components have different harmfulness. The development of life and economy in each city is different, and the reaction relationship of exposed chemicals is also different. The harm is different in different cities the occurrence of lung cancer is a long-term slow process, even if the relationship between haze and lung cancer can be determined, it is also caused by long-term living in the haze environment for many years. Lung cancer is a chronic lifestyle disease. The relationship between haze and lung cancer is similar to that between tobacco and lung cancer, which is a cumulative process. Living in a place where harmful substances exceed the standard for a short time will not have much effect on inducing lung cancer. 1f long-term stay in PM2.5 seriously exceed the standard, the incidence of lung cancer is bound to increase. This is closely related to the local concentration of harmful substances and the length of stay< A large number of studies have shown that smoking is the primary risk factor for lung cancer. 1t takes about 15 to 50 years from the beginning of smoking to the occurrence of lung cancer. The number and age of smokers are related to the risk of lung cancer. But we are also exploring whether there are other incentives for the incidence rate of lung cancer. Br/>
Beijing cancer prevention Office in 2010, specifically for 1346 cases of lung cancer in Beijing registered residence to investigate. The results showed that 56.8% of the respondents had smoking habits. The smoking rate of male was 79.4%, and that of female was 19.4%; The average age of starting smoking is 25 years old, with an average of 20 cigarettes a day. The average duration of smoking is 40 years, and the cumulative duration of smoking is 40 bags of years. All of them are “old smokers”. Among these smoking cases, 26.7% have quit smoking. The average age of starting smoking is 62 years old, with an average of 7.5 years

according to several monitoring data, smoking is the main factor inducing lung cancer. The incidence rate of lung cancer is mainly increased by the incidence rate of linear cell carcinoma. The first reason for the rise of lung cancer is smoking, including second-hand smoke, followed by air pollution and mental stress

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