Suddenly quitting smoking can cause the onset of coughing, a phenomenon actually called withdrawal syndrome, which means that the symptoms of coughing or increased coughing after suddenly quitting smoking is one of the manifestations of withdrawal syndrome, which is mostly seen in long-term smokers and smokers who are extremely addicted to smoking, often manifesting itself in the first few weeks after starting to quit smoking, from no cough or mild coughing symptoms, manifesting itself in a marked increase in coughing symptoms, but its pathology and physiology are not fully understood. It is speculated that this may be due to the fact that after the chronic damage to the airways, such as the bronchi, from long-term smoking is suddenly terminated, some necrotic tissue is shed during the gradual repair of the airways, stimulating the cough receptors in the airways to produce cough symptoms. However, as smoking cessation continues, the cough usually decreases or is eliminated within a few weeks after quitting. It has also been reported that patients with bronchiectasis who quit smoking experience worsening cough after quitting, but in the vast majority of cases the cough symptoms gradually diminish. Thus, the long-term effects of quitting smoking are positive.