The causes of always smelling like soot are environmental factors, nasal disorders, neurological disorders, and schizophrenia. 1. Environmental factors: burning fuel for heating in winter, poor indoor ventilation, gas pipe leakage, etc., there will be a smell of soot. 1. Nasal diseases: suffering from rhinitis, sinusitis may not be able to smell the flavor or the smell is more confusing. 2. Neurological diseases: Olfactory nerve tumors, epilepsy and other neurological disorders, there will be the possibility of smelling strange smells, resulting in problems with the sense of smell. 3. Schizophrenia: phantom smell is one of the typical manifestations of schizophrenia, which is able to smell flavors that others cannot. The above are some of the common causes. If the symptoms persist or recur, you should seek medical advice. After a clear diagnosis, follow the doctor’s instructions to standardize the treatment.