Some of the changes that occur in the body after a year of smoking cessation include a reduced risk of cardiovascular disease, improved lung function, and a better mental state. 1. Reduced risk of cardiovascular and cerebrovascular diseases: Quit smoking for a year, the nicotine in the body will be slowly removed, which can make the cellular blood oxygen carrying capacity to be restored, blood circulation to improve, and is conducive to the prevention of cardiovascular and cerebrovascular diseases. 2. Lung function is improved: quit smoking about three months, the lung villi can basically be restored, quit smoking a year later, breathing can become smooth, and lung capacity will be greatly improved. 3. Better mental state: Although you will feel irritable when you quit smoking at the beginning, you will have a better mental state after quitting smoking for a year or so, and you will feel energetic when you wake up in the morning, and your mind will become clearer on weekdays. Smoking is harmful to health, it is recommended to quit smoking under the guidance of a physician.