Which is more harmful, smog or secondhand smoke?

Smog weather can easily lead to upper respiratory tract infection, with cough, sneezing and runny nose as the main symptoms; Inhalable particulate matter, sulfur dioxide and other pollutants in foggy days are the main factors inducing asthma and chronic bronchitis. At the same time, it is cold and foggy in winter, and the air pressure is low, which is prone to hypoxia and ischemia, causing coronary vasospasm, thus inducing cardiovascular and cerebrovascular diseases.

Dense fog and low visibility weather will have an impact on human health. The composition of smog is very complex, including hundreds of atmospheric particles. Among them, aerosol particles with a diameter less than 10 micron are the main hazards to human health, which can directly enter and adhere to the upper and lower respiratory tract and lung lobes of human body, causing rhinitis, bronchitis and other diseases, and can also induce lung cancer in this environment for a long time.

Smoking is harmful to people's health, which is not a new topic, but what should be paid more attention to now is that second-hand smoke also seriously affects people's health, and its harm is even greater. Medical research shows that if teenagers learn to smoke or often smoke passively in the process of growth and development, their resistance to harmful factors in the external environment is weaker than that of adults, and they are easy to absorb poisons and damage the normal growth of the body. According to the survey of 25 states in the United States, the age of starting smoking is negatively correlated with the mortality rate of lung cancer. If the mortality rate of lung cancer in non-smokers is 1.00, the mortality rate of smokers below 15 is19.68; 20 ~ 24 years old is10.08; People over 25 4.08. It shows that the earlier you start smoking, the higher the incidence and mortality of lung cancer. Coupled with the limited tolerance of young people in the development period for external temptations, more and more young people have learned to smoke, and even cigarettes have never left their hands.

The threat of severe smog and smoking to human lungs is very serious, especially for men, which not only affects lung health, but also easily leads to dysplasia of reproductive system, ultimately affecting reproductive function and causing lifelong regret. Experts pointed out that smog can be prevented, but smoking and second-hand smoke cannot be prevented. This test is the comprehensive quality of the people. Only when people's quality is improved, the number of smokers in public places is reduced, and the harm of second-hand smoke to human body is less. So fundamentally, it is necessary to compare which is more harmful to people's health, or that smoking and second-hand smoke are more harmful to the body than severe smog.