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Is secondhand smoke really more harmful than first-hand smoke

Is secondhand smoke really more harmful than first-hand smoke in recent years, people begin to pay more and more attention to the problem of second-hand smoke. When many people read all kinds of news or reports, they think that second-hand smoke is more harmful than first-hand smoke. Second-hand smoke not only harms their bodies, but also poses a great threat to the health of people around them. But second-hand smoke is really more harmful than first-hand smoke?

Second hand smoke causes many health hazards, including increasing the risk of cardiovascular disease, cancer, respiratory disease in adults, aggravating the degree of asthma in children, causing pneumonia, otitis media and even behavioral problems in children. Especially for pregnant women and teenagers, it is more harmful than you expected.

Studies have shown that under the same concentration, the harm of second-hand smoke is greater, because the temperature of branch smoke combustion is lower than that of mainstream smoke, and incomplete combustion produces more carcinogens, so the harm of 'second-hand smoke' is indeed greater.

However, in general, the concentration of second-hand smoke is far lower than that of mainstream smoke, especially around non-smokers. (this article is edited and collated by, reprinted and noted with source, original link:

What's the harm of smoking secondhand smoke for a long time

1. Lung cancer

Second hand smoke often contains more harmful substances than mainstream cigarettes, such as twice the amount of nicotine, three times the amount of tar, five times the amount of carbon monoxide and about 50 times the amount of carcinogens, according to China's eating website. According to the calculation, in a place with poor ventilation, the average amount of smoke inhaled by non-smokers within one hour is equivalent to the dose of a cigarette inhaled. According to the survey, smokers have a significantly higher chance of developing lung cancer than non-smokers. Through the analysis of smoke inhaled by smokers, dozens of carcinogens were found in the smoke. The risk of lung cancer is related to the time of smoking. The earlier the age of smoking, the greater the risk. The longer the smoking time, the higher the incidence and mortality of lung cancer. (this article is edited and collated by, reprinted and noted with source, original link:

Women are more vulnerable to tobacco than men. Some women who live with smokers are six times more likely to develop lung cancer. It should be noted that the risk of lung cancer in female smokers is also more serious, 1 or 9 times higher than that in male smokers. Second hand smoke is no less harmful to passive smokers than active smokers, especially to pregnant women and children. Studies have shown that people who smoke 'second-hand smoke' are at the same risk as smokers when they spend more than 15 minutes with them every day. 75% of lung cancer patients were investigated for smoking.

2. Harm to memory

Nicotine and other harmful substances in the smoke stimulate the brain, which can cause cerebrovascular sclerosis and affect brain function. The intelligence development of children who smoke passively for a long time is significantly worse than that of children who grow up in non smoke environment.

Non smokers who were often exposed to second-hand smoke scored 20% lower on memory tests than the other group. Smokers performed worse, scoring 30% lower than non-smokers who were not exposed to second-hand smoke.

3. Cause asthma, pneumonia and ear inflammation in children

Children are the biggest victims of environmental pollution. Generally, children will experience higher environmental exposure than adults, they will breathe more air than adults, so they will inhale more pollutants. In addition, children's hyperactivity, poor self-protection and immune function make them most vulnerable to pollutants. If the father smokes at home, the child will not do anything against him or take some measures to protect himself. He can only be forced to smoke second-hand smoke. However, the harm of secondhand smoke to children's health mainly includes: asthma, sudden death syndrome, tracheitis, pneumonia and ear inflammation.

4. Coronary heart disease

Smoking causes heart disease, not only for those who actually smoke, but also for non-smokers who are exposed to second-hand smoke. Second hand smoke exposure can cause acute coronary heart disease, even if exposure to second-hand smoke for a short time will cause a sharp rise in the risk of coronary heart disease, which is biologically certain.

Smoking increased the risk of coronary heart disease by 4 to 6 times in men and 6 to 9 times in women; exposure to environmental tobacco smoke increased the risk of death from heart disease in non-smoking women, and secondhand smoke significantly increased the incidence of coronary heart disease, ischemic stroke and peripheral vascular disease in women. The causes of coronary heart disease caused by passive smoking are: the chemicals inhaled by passive smoking can make blood fat abnormal, blood sticky, destroy myocardial tissue, reduce the ability of blood vessels to regulate blood pressure and blood flow, and then increase the risk of myocardial infarction.

5. Harm to pregnant women and infants

Nicotine and other harmful substances can be detected in amniotic fluid of 90% pregnant women who smoke secondhand smoke passively, which indicates that tobacco smoke directly pollutes the environment of the uterus where the fetus grows. Second hand smoke exposure is an important risk factor for pregnancy induced hypertension (PIH) and pregnancy complications. At the same time, second hand smoke exposure has a serious impact on the health of pregnant women from the beginning of fetal period. Second hand smoke exposure also affects the proliferation and differentiation of embryonic cells, resulting in abnormal embryonic development, which is manifested in the development of nervous system and intrauterine growth retardation.

If a mother inhales second-hand smoke for a long time during pregnancy, most of the harmful chemicals released from tobacco burning can 'harass' innocent babies through the placenta. In particular, toxic gases such as carbon monoxide will reduce the blood oxygen concentration in the mother's body, which will lead to fetal hypoxia; and nicotine, an addictive drug in tobacco, can cause vascular stenosis and slow down the blood flow, which means that the nutrition and oxygen provided to the fetus will be reduced, which will easily lead to premature birth. However, premature infants are prone to respiratory, digestive and thermoregulatory disorders, and even die shortly after birth.

6. Pharyngitis

Long term secondhand smoke is a common cause of chronic pharyngitis. Tar, nicotine, nicotine and other harmful substances in the smoke can inhibit the activity of respiratory cilia, weaken the purification ability of respiratory tract, cause congestion and edema of bronchial mucosa, so as to make external pathogens enter the bronchus and cause repeated infection of this part, thus leading to chronic pharyngitis. (this article is edited and collated by, reprinted and noted with source, original link:

Smoking second-hand smoke is more harmful than smoking, because the harmful substances contained in the smoke are more than the harmful substances inhaled into the body by smokers, and the substances such as carbon monoxide and nicotine contained in the body of people who smoke second-hand smoke for a long time will be more than smokers themselves, so the risk of chronic pharyngitis is greater than others.

7. Leading to female infertility

From the clinical point of view, smoking will have adverse effects on female reproductive function, sexual function, endocrine and other aspects, increasing the risk of infertility. According to the clinical investigation, the probability of infertility of the direct smokers and the second-hand smokers is 2.7 times higher than that of the non-smokers. At the same time, smoking will seriously damage women's reproductive function, resulting in a lower probability of pregnancy. If both men and women smoke at the same time, the pregnancy rate of women will be lower.

8. Lead to leukemia and tumor

A study in the United States shows that smoking by a husband can increase the risk of leukemia by seven times for a nonsmoking wife. The risk of breast cancer and cervical cancer in 6-45-year-old women who smoke passively at home is 3-4 times higher than that in non-smoking women. (this article is edited and collated by, reprinted and noted with source, original link:

Due to the carcinogens of tobacco, the proportion of adults and children suffering from blood diseases, especially leukemia, has greatly increased. According to statistics, the benzene inhaled by smokers is 10 times higher than that of non-smokers, so the risk of leukaemia of smokers is 6-7 times higher than that of non-smokers; the statistics of children's leukaemia factors in Xinhua Hospital show that more than 60% of children's families with leukaemia have second-hand smoke pollution. It is suggested that smoking plays an important role in the pathogenesis of leukemia.