Inclusion Criteria:  Chronic rhinitis  Exclusion Criteria:  Active smoker Anatomic source of nasal symptoms Chronic rhinosinusitis or other nasal infection History of sinonasal malignancy Pregnancy or lactation Use of medication affecting nasal function (topical steroids, topical anticholinergics, oral antihistamines) in the previous 4 weeks Use or abuse of nasal decongestants. Positive skin prick test for allergic rhinitis