Statement of the Problem: Smoking affects not only smokers themselves, but also the people around them. 700 million children are exposed to second hand tobacco worldwide. One of the adverse effects of being a passive smoker is oral pigmentation.
Purpose: Evaluating association between being a passive smoker and oral pigmentation.
Materials and Method: This is a historical cohort. 140 healthy children aged from 4 to 10 with the mean age of 6.68±1.60 years old (70 with a smoker parent and 70 without smoker parents) were examined for oral pigmentation. Environmental factors were evaluated by asking the parents to fill a questionnaire. Data were analyzed using Chi-square test, Fisher's exact test, Logistic regression and Spearman scale.
Results: There was a meaningful relationship between having a smoker parent and oral pigmentation (P-value=0.0001). spearman correlation showed parents' duration of cigarette smoking and the number of cigarettes per day meaningfully affect the severity of oral pigmentation (R=0.329). The study did not find a statistical relationship between oral pigmentation in passive smoking and sex or house area.
Conclusion: Children exposed to secondhand tobacco are at more risk for oral pigmentation. Its severity depends on duration of cigarette smoking and the number of cigarettes per day.