The present study aimed to assess and compare the effect of smoking on ultrastructure morphology of nasal mucosa between smokers and nonsmokers. The study included 50 subjects aged 25-62 years who were planned for rhinological surgical procedures. Subjects were divided into 3 groups- group 1 (nonsmoker), group 2 (smokers taking 1 pack/day or less), group 3 (smokers taking 2 pack/day or more). During surgery, two 1-mm