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The aim of this study is to assess the olfactory functions of passive smokers compared to active smokers and nonsmokers.

This prospective case‐control study included 30 nonsmokers, 30 passive smokers, and 30 active smoker participants. All groups were matched for gender and age. The Sino‐Nasal Outcome Test 22 (SNOT‐22) and Sniffin' Sticks test battery were administered to all subjects. Threshold (T), discrimination (D), and identification (I) scores were noted. Olfactory function was subjectively assessed as 0: severe dysfunction and 5: no problem.

Overall, TDI scores of active smokers (24.78 ± 3.02) and passive smokers (24.90 ± 2.45) were significantly lower than nonsmokers (34.23 ± 3.46). There was no statistically significant difference between passive smokers and smokers (F_(2,87) = 13.47, P < .001)). All subscores are negatively affected by active or passive …