1 and 25% of lung cancer are related to secondhand smoke;

2. "Secondhand smoke" directly damages children's lungs and brains; Studies have confirmed that pregnant women who smoke more than 10 cigarettes a day during pregnancy (including passive smoking) have an increased risk of acute lymphoblastic leukemia in their children 1 times. However, children's passive acceptance of "second-hand smoke" is more harmful because of their vigorous metabolism and imperfect immune function.

Secondhand smoke is a kind of mixed smoke that is burned or exhaled by cigarettes, pipes or cigars when smokers smoke. Secondhand smoke is the most common pollutant in many smoking places. Smoke emitted during smoking can release more than 4,000 kinds of gases and particles, most of which are very strong irritants, and at least 40 of them can cause cancer in humans or animals. After smokers quit smoking, these particles can still stay in the air for several hours, can be inhaled by other non-smokers, and may be mixed with the decay products of radon gas, causing great harm to human health.

When smoking harms smokers' own health, second-hand smoke will also affect non-smokers. In addition to irritating eyes, nose and throat, it will significantly increase the risk of lung cancer and heart disease in non-smokers. If children live with some smokers, their respiratory system will be more susceptible to infection. Other diseases include increased cough, asthma, excessive phlegm, impaired lung function and slow lung development. But now there is a better solution to secondhand smoke. For example, the very famous k-smoker health therapy can completely avoid second-hand smoke. Because it doesn't burn at all, it doesn't have all the toxic substances in cigarettes, and there is no harm from second-hand smoke.