If you smoke when you have pneumonia, it can aggravate the disease and also affect the effectiveness of the treatment of pneumonia. Pneumonia is mainly caused by viruses, bacteria, mycoplasma and other pathogenic microorganisms that cause fever, cough, phlegm and, in severe cases, shortness of breath, chest tightness and difficulty in breathing. If you smoke at this time, it will aggravate the symptoms of chest tightness and dyspnea, because there are many harmful substances in tobacco that will irritate the respiratory tract, and you will inhale carbon monoxide during the process of smoking that will affect oxygen intake. When you have pneumonia, you need to use medication, and smoking during oral medication can increase the side effects of the medication and affect the effectiveness of the medication, so you should not smoke at this time. You also need to pay attention to your diet, drink more water, eat more fresh vegetables and fruits, eat more food with high protein content, to strengthen the body’s resistance to help the recovery of the disease.