Smoking for a year will produce many changes in the lungs, such as darkening of the lung color, thickening of the lung texture, lung function decline. 1. Lung color darkening: nicotine in tobacco, tar will be adsorbed on the mucous membrane of the lungs, precipitation, time becomes longer, will affect the normal lung color. Smoking for a year may cause the lungs to gradually darken and turn black over time. 2. Thickening of lung texture: People who smoke for up to one year will show an increase in blood vessel shadow, i.e., thickening of lung texture, which is mainly related to the stimulation of smoking. 3. Decline in lung function: Smoking will destroy the normal respiratory function of the human body, so that sputum and other secretions can not be effectively discharged, resulting in a significant decline in the function of the patient’s lungs. Smokers are advised to quit smoking as soon as possible and consult a professional respiratory physician if they feel unwell.