Five months after quitting smoking, one’s cardiorespiratory function will improve, one’s teeth and breath will become better, and one’s mental state will improve, but the specifics will vary according to one’s physical condition and the degree and duration of smoking. 1. Cardiorespiratory function: Long-term smokers’ cardiorespiratory function is generally not as good as that of people who have never smoked, especially the lung capacity will deteriorate. This is because the nicotine, tar and carbon monoxide in cigarettes can cause greater damage to the heart and lungs. If you can insist on quitting smoking for five months, people’s cardiopulmonary function will have a certain degree of improvement, so that the heart rate, blood pressure and lung capacity gradually return to normal. 2. Teeth and breath: long-term smokers due to the tar in the cigarettes attached to the teeth, will lead to varying degrees of yellowing of the teeth, accompanied by heavier breath. If you insist on quitting smoking for five months, your breath will become normal and the yellowing of your teeth will gradually improve. 3. Mental state: Long-term smokers will experience mental paralysis, occasional dizziness, and mental instability. If you quit smoking after five months, the symptoms will improve and you will gradually become full of energy. Smoking is harmful to your health, so it is advisable to quit smoking as soon as possible and develop good habits.