1, respiratory system: the relative risk of lung cancer of smokers is 10- 15 times that of non-smokers, and the risk of lung cancer of a smoker after quitting smoking 10 years will be 30%-50% of that of continuous smokers. Quitting smoking can also reduce the risk of pneumonia and bronchitis. Smoking is the main cause of chronic obstructive pulmonary disease (COPD). After quitting smoking, the rate of lung function decline with age will be close to that of non-smokers.
2, circulatory system: the risk of smokers dying of coronary heart disease is twice that of never smokers. Within one year after smokers quit smoking, this risk will be reduced by 50%. After quitting smoking 15 years, the risk will be close to that of never smokers.
3. Nervous system: Compared with non-smokers, the relative risk of death from stroke is twice that of non-smokers. Some smokers can reduce this risk to the level of non-smokers within five years after quitting smoking, while others need to persist for 15 years to receive this effect. In addition, quitting smoking can improve cerebral blood flow.
4. Pregnant women smoking makes the fetal and infant mortality rate 25_50% higher than that of normal non-smokers, and the average weight of infants at birth is 200 grams lower than the normal value. If they can quit smoking before getting pregnant, their babies will weigh almost the same as those born to mothers who never smoke.
Some people worry that they will get fat, but a large number of studies show that the average weight gain of smokers is only 2.3 kilograms. This weight gain has little effect on health. Of course, there are very few people who gain more weight (more than 9 kg) after quitting smoking, but the possibility of quitting smoking is only 4%.