Changes after two years of smoking cessation, if the respiratory diseases such as chronic inflammation caused by smoking, the inflammatory symptoms, phlegm will be relatively reduced after quitting smoking, the same nerve stimulation is reduced, the quality of sleep will be better. Smoking is harmful to health, it is recommended to quit smoking in time, but the process of quitting smoking may appear withdrawal syndrome, such as dizziness, nausea, hand tremor, panic and other discomforts, the symptoms can be improved through exercise and so on, if the symptoms are more serious, it is recommended to consult a doctor in time. 1. Reduced symptoms of respiratory diseases: Long-term smoking will make patients prone to chronic bronchitis and other respiratory diseases. After quitting smoking, the symptoms of chronic bronchitis, such as coughing, reduce the number of sputum coughing. 2. Better sleep quality: As a result of quitting smoking, the intake of nicotine in cigarettes will be reduced, and nicotine reduces the stimulation of nerves. After quitting smoking, the quality of sleep may show significant improvement. Smoking is hazardous to health and it is recommended to quit smoking as soon as possible.