Linked from
The 9 pages that link to Nasal polyps, each with the reason it gives.
Nasal cavityRelated: Large polyps can obstruct airflow through the nasal cavity.
AnosmiaRelated: Polyps can physically block odor molecules from reaching sensory tissue.
HyposmiaBroader topic: Large polyps can obstruct airflow and diminish smell.
Human noseRelated: Polyps can obstruct nasal airflow and reduce access of odorants to receptors.