If you have smoked before taking the New Coronavirus Nucleic Acid Test, you can delay taking the nucleic acid test appropriately. The new coronavirus nucleic acid test is usually performed by extracting secretions from the throat or nasal passages, and then the test is usually able to determine whether or not a person is infected with the new coronavirus. However, smoking is not recommended half an hour before the nucleic acid test because cigarettes contain more harmful substances such as tar and nicotine, which may affect the environment of the mouth as well as the nasal passages. This may lead to an increase in secretions in the mouth and throat, which may be accompanied by spitting and repeated swallowing of saliva, which may decrease the viral content in the pharyngeal saliva and lead to false-negative test results. Therefore, you can delay the nucleic acid test after smoking and do it half an hour later to ensure the accuracy of the test results. You should also try to avoid eating two hours before the nucleic acid test to avoid nausea and dry heaving during the test, which may result in contamination of the specimen with vomitus and affect the accuracy of the test results.