You should not smoke before the physical examination, because smoking can affect the results of some tests, especially the platelet test results in the blood routine will be biased. In addition, smoking is harmful to the human body, which is a common understanding, the World Health Organization requires to quit smoking and limit alcohol. The damage to the endothelium of blood vessels is the main cause of the damage caused by smoking. Smoking can cause nasopharyngeal and lung cancer, and many mouse tests have fully confirmed the correlation between smoking and the occurrence of lung cancer. Therefore, try not to smoke at any time.