How harmful is secondhand smoke? Very harmful

The harmful substances in second-hand smoke are much higher than those in first-hand smoke, so frequent exposure to second-hand smoke is very harmful. It may cause lung cancer, coronary heart disease, respiratory diseases, etc.; pregnant women who inhale second-hand smoke may suffer from fetal malformations.

Some people do not smoke themselves, but there are often people smoking at home or in the workplace, so they are passively exposed to second-hand smoke every day. The content of harmful substances in second-hand smoke is much higher than that in first-hand smoke, so how harmful is it to often inhale second-hand smoke?
1. Causes lung cancer <br/>Research has found that women whose husbands smoke regularly are 1.5 to 2 times more likely to develop lung cancer than other people. Generally speaking, the longer the husband has smoked and the more addicted he is to smoking, the more serious the harm to his wife is, and the higher the chance of developing lung cancer.
2. Induce coronary heart disease <br/>Frequent passive exposure to secondhand smoke often affects blood lipids, which may cause blood lipids to thicken, slow blood circulation, and affect blood and oxygen supply to the myocardium. At this time, the risk of coronary heart disease tends to increase significantly.
3. Suffer from respiratory diseases <br/>Long-term exposure to secondhand smoke may also cause respiratory diseases, especially children are more likely to get sick. Harmful substances in smoke affect the respiratory system and often induce bronchitis, pneumonia, asthma, etc.
4. Causes fetal malformation <br/>Pregnant women should stay away from secondhand smoke. If pregnant women are passively exposed to secondhand smoke for a long time, the harmful substances in the smoke will be inhaled into the body and often harm the baby through the placenta, causing fetal hypoxia, developmental malformations, etc.