Smoking may cause nasopharyngeal carcinoma. Generally the earlier the age of smoking, the higher the risk of inducing nasopharyngeal cancer. When tobacco is burned, it can produce a large amount of carcinogenic substances, including benzo(a)pyrene, nitrosamines, phenolics, formaldehyde, acetaldehyde, etc. The smoke also contains harmful gases such as carbon monoxide, which can induce cancer. And nitrosamines can form malignant tumors or an environment suitable for the growth of cancer cells, and therefore may induce nasopharyngeal cancer. Long-term smoke irritation of the delicate mucous membrane in the nasopharynx can easily cause genetic mutations as well as mutations. The lacrimal gland will overproduce tears under the stimulation of smoke, and excessive solid secretions will accumulate in the lacrimal ducts, thus causing swelling and blockage of the lacrimal gland, which is also a major factor causing nasopharyngeal cancer. If a smoker has frequent tinnitus, ear canal swelling, laryngitis, dry cough and excessive nasal discharge for a longer period of time, it is recommended to visit a hospital in time, and if necessary, nasopharyngeal endoscopy should be performed to check whether there is nasopharyngeal cancer.