The Snuff Tobacco Reference

Nasal Cycle

The nasal cycle is a process of mammalian physiology that functions to have a given nostril relatively unhindered whilst concurrently having the other nostril relatively hindered, with the nostrils alternating in role periodically throughout the day. The nasal cycle is estimated to be present in eighty per cent of humans, and the purpose or purposes of the nasal cycle are unclear.


  1. Scott-Brown’s Otorhinolaryngology. Fifth Edition; Volume 4; Pages 46–47. 1987.
  2. Diseases of the Sinuses. M. Eric Gershin; Gary A. Incuado. Pages 45–46. 1996.