The effects of inhalation of L‐menthol, D‐isomenthol and D‐neomenthol, upon nasal resistance and sensation to airflow were investigated in 40 subjects. L‐menthol caused a highly significant enhancement of nasal sensation of airflow but despite their great similarity in structure and a similar peppermint smell the isomers D‐isomenthol and D‐neomenthol had no effect on nasal sensation of airflow. These findings show that L‐menthol has a specific pharmacological action on nasal sensory nerve endings which is not related to its pep