Bad breath and smoking generally have a certain relationship. If you often smoke in your normal life, there are more harmful substances in the smoke, such as nicotine, carbon monoxide, etc., and during the combustion process, the harmful substances may enter the body and then be expelled through the lungs, and then through the pharyngeal cavity to reach the oral cavity, bad breath symptoms may occur. If you want to relieve bad breath symptoms usually need to control the number of cigarettes or quit smoking. Although there is a relationship between bad breath and smoking, it is not necessarily caused by smoking, but can also be caused by gastroesophageal reflux, gastritis, dental calculus and other problems. If you often have obvious bad breath symptoms, it is recommended to consult a doctor in time to determine whether there is a disease.