Coughing from smoking is caused by the irritation of the throat caused by smoking, which leads to coughing. At this time, it is recommended to stop smoking immediately and eat food or medication to clear the throat, such as ice orange and sweet plum tablets or Golden Voice Throat, or watermelon cream tablets are also acceptable. If there is no relief after taking these medications, it is necessary to go to the hospital to check the chest CT to see if there is chronic bronchitis, bronchiectasis or pneumonia. If any of these conditions are present, a sputum culture needs to be done to check for the specific type of bacterial or pathogenic infection. For the type of infection, specific medication is administered, commonly cephalosporin antibiotics are used for bacterial infections.