Smoking six months of lungs are changes, generally will appear cilia inhibition, lung cell changes, weakening of lung function and other changes, but the specific varies from person to person. 1. Cilia inhibition: After smoking for six months, the ciliated hairs in the airways of smokers will be inhibited, resulting in sparse cilia, cilia inversion and other manifestations, which reduces the ability of the lungs to clean, so that phlegm and other harmful substances can not be effectively discharged. 2. Lung cell changes: Smoking is not simply smoking, but will contain many toxic substances within the smoke, which are attached to the alveoli and mucous membrane of lungs, thus stimulating the lung cells, causing changes in the lung tissues, and increasing the chances of lung cancer. 3. Weakening of lung function: smoking for half a year will make the space for oxygen exchange in the lungs decrease, thus leading to the decline of lung function. Smoking is harmful to health, it is recommended to quit smoking as early as possible.