There are many reasons for coughing when smelling smoke, which may be due to asthma, allergic rhinitis, chronic obstructive pulmonary disease, and so on. 1. Asthma: Asthma is characterized by high airway response, accompanied by coughing, wheezing, chest tightness and other symptoms. Smell of smoke can easily trigger the occurrence of asthma, which leads to coughing, chest tightness and other symptoms. 2. Allergic rhinitis: Allergic rhinitis is due to the nasal mucosa is stimulated by allergens, so the body has an overactive immune response. Some people are sensitive to the smell of smoke, and when they smell smoke, there will be nose, nasal congestion, paroxysmal continuous sneezing and other symptoms. 3. Chronic Obstructive Pulmonary Disease (COPD): COPD is characterized by recurrent coughing, shortness of breath, coughing up phlegm, and coughing is often aggravated by the smell of smoke and cold air. There are many reasons for coughing when you smell smoke, so it is recommended that you go to the hospital in time to clarify the cause of the disease and get treatment under the guidance of your doctor.