The nose always smells like smoke and fire may exist intracranial lesions, but there may also be other reasons, such as rhinitis, nasal polyps, etc., the specific circumstances should go to the hospital to clarify the cause of the disease. 1. Intracranial lesions: If intracranial lesions (such as cerebral infarction, brain tumor, etc.) cause damage to the olfactory nerve, or even damage to the nucleus of the olfactory nerve, the nerve conduction pathway of the olfactory nerve will be affected, and you may smell smoke, and you may also have a loss of smell. 2. Nasal inflammation: rhinitis is due to bacteria, viruses and other pathogens invade the nasal mucosa, resulting in inflammatory reaction of the nasal mucosa, repeated stimulation of the nasal mucosa will affect the olfactory cells; sinusitis also affects the olfactory cells, sinuses and the intracranial communication, long-term pathogens to stimulate the mucous membrane cells to secrete inflammatory substances, these substances will stimulate the obstruction of the olfactory nerve conduction pathway, there is a wrong sense of smelling smoke. 3. Nasal polyps: nasal polyps in the nasal cavity will compress the olfactory mucosa at the top of the nasal cavity, damaging the olfactory cells, leading to abnormal sense of smell. There are many reasons why your nose always smells like smoke and fire, it is recommended that you should go to the hospital in time to check the cause of the disease, make a clear diagnosis, and treat it under the guidance of a professional doctor, so as not to delay your condition.