China has the largest smoking population in the world. Studies have shown that, regardless of active smoking or passive inhalation of second-hand smoke, there is a significant positive correlation between the amount of smoking and the risk of cardiovascular diseases, tumors, or the onset of chronic respiratory diseases and mortality, and that the incidence of coronary heart disease, hypertension, cerebrovascular disease, and peripheral vascular disease among smokers is significantly higher. Aggressive smoking cessation is effective in reducing cardiovascular morbidity and mortality. The benefits accrue regardless of when you quit. The sooner you quit, the more you will benefit. I. What happens to the body after quitting smoking? First of all, long-term smokers will experience “withdrawal symptoms” after quitting smoking, such as anxiety, irritability, headache, poor concentration, dry mouth, thirst, insomnia, etc. Secondly, some quitters will experience weight gain, etc. Many of the harms of smoking will occur after quitting. Many of the harms of smoking are gradually reversed after quitting, and all of the harms of smoking may be eliminated to some extent or completely by quitting in a timely manner. Weight gain after quitting smoking may be related to the fact that people get hungry easily after quitting smoking (withdrawal response), changes in food preferences (eating larger meals, increased intake of high-calorie foods), and slower metabolic rate of the body compared to that of smoking. Some studies have shown that most weight gain after quitting occurs within three months of quitting, with an increase of 1-2 kg in the first few weeks, 2-3 kg in the following 4-5 months, and an average increase of 4-5 kg over a year.Some people do not quit smoking for fear of gaining weight after quitting, so this weight gain may hinder quit attempts and may offset the health benefits of quitting by increasing the risk of cardiovascular disease and premature death. benefits of quitting. Second, smoking makes you obese, is it harmful? A recent study assessed the risk of type 2 diabetes, the risk of death from cardiovascular disease, and the risk of death from any cause among participants who had reported quitting smoking, based on changes in body weight after quitting. The findings showed that recent quitters had a higher risk of type 2 diabetes than current smokers. The risk peaked 5 to 7 years after quitting and then gradually decreased. the temporary increase in type 2 diabetes risk was directly proportional to weight gain, with no increase in risk among quitters who had not gained weight. In contrast, there was no temporary increase in mortality among quitters, regardless of whether weight changed after quitting. Compared with current smokers, the risk ratio for cardiovascular disease mortality was 0.69 for recent quitters who had not gained weight, 0.47 for recent quitters who had gained 0.1-5.0 kg, 0.25 for recent quitters who had gained 5.1-10.0 kg, 0.33 for recent quitters who had gained more than 10.0 kg, and 0.50 for those who had quit for a more prolonged period of time (quit for >6 years). death from any cause had similar correlations. Gaining weight with substantial weight gain is associated with an increased short-term risk of type 2 diabetes, but does not offset the benefits of smoking cessation in reducing cardiovascular and all-cause mortality. Therefore, although smoking cessation may bring about obesity, in order to reduce the risk of cardiovascular and cerebrovascular disease, it is more important to actively quit smoking as early as possible, and during the period of cessation of smoking, keep your mouth shut, take steps to control the type and amount of food eaten, less greasy, more fruits and vegetables, and strengthen the movement and exercise, it is possible to avoid the obesity after cessation of smoking.