Abstract
Bacground: Our study was planned to reveal the objective relation between urine cotinine level and tobacco smoke exposure in children suffering from chronic cough.
 Methods: Between ages 5-18 years, 58 patients with chronic cough with no underlying specific cause and 54 healthy individuals were included in the study. 
 Results: There was a statistically significant difference between urine cotinine levels of cases those who exposed and unexposed (based on the declaration of parents) to tobacco smoke (p
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