Continuing to smoke in patients with pulmonary nodules may increase the probability of developing pneumonia, and as tobacco contains carcinogens, continuing to smoke may increase the risk of cancer. 1. Inhalation of more harmful substances: Lung nodules are granulomatous diseases that usually involve the lungs and bilateral hilar lymph nodes. Tobacco contains more harmful substances, such as nicotine, tar and carbon monoxide. If you continue to inhale harmful substances, it will irritate the mucous membrane of the respiratory tract, induce coughing and other uncomfortable symptoms, and may increase the probability of pneumonia. 2. Carcinogenic risk: Smoking in patients with pulmonary nodules is more harmful to the body, which may lead to the growth of nodules and aggravate the condition. Nicotine and other substances have carcinogenic effects and may increase the probability of malignant changes in lung nodules. If you are diagnosed with pulmonary nodules, you must quit smoking, avoid spicy and irritating food, avoid smoke and dust stimulation, and exercise properly to improve immunity.