Insomnia, coughing, anxiety and irritability, inability to concentrate, etc., may occur 1 to 3 days after quitting smoking, and some of them may also experience somatic discomfort, such as dizziness, headache, panic attacks, palpitations (rapid heartbeat, often accompanied by heartburn), nausea, vomiting, sweating, and trembling. In the initial period after a person quits smoking, there will be a certain withdrawal reaction, the withdrawal reaction occurs because of the person’s overdependence on nicotine and tar, is a syndrome of endocrine disorders of the nerves and body fluids, the more common symptoms include changes in the psychoneurological system, for example, anxiety and irritability, insomnia, and the inability to concentrate, and so on. Withdrawal syndrome can also be characterized by the appearance of somatic complaints, such as dizziness, headache, panic, palpitations (rapid heartbeat, often accompanied by panic), nausea, vomiting, sweating, and trembling. The longer you smoke and the more you smoke, the more likely you are to experience nicotine withdrawal syndrome, and the more severe the symptoms become, making it impossible for you to quit smoking or easy for you to relapse. If the symptoms are obvious and difficult to adhere to, please seek medical advice and quit smoking under the guidance of a doctor.