Weight gain after quitting smoking is a common phenomenon, and the specific time of weight gain may vary from person to person. Generally speaking, after quitting smoking, the weight can increase by about 1 kg within 1 month, and within half a year to 1 year, more than half of the smokers can gain 4-5 kg.

The main reason for weight gain is that after quitting smoking, people's anxiety, nicotine and other components decrease, and their appetite and digestive function may change, which leads to weight gain.

Therefore, in the process of quitting smoking, smokers need to control their diet and exercise properly to avoid excessive weight gain. At the same time, smokers can also seek the help of doctors, make reasonable diet and exercise plans, and maintain a healthy weight and lifestyle.