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home have roughly double the exposure in high smoking communities than in low smoking ones.In conclusion, our data emphasise the value of measuring cotinine in the saliva as a simple non- invasive marker of passive exposure to tobacco smoke.Maternal smoking had a greater effect than paternal smoking on cotinine concentration despite its lower prevalence.However, 7-1 1% of the population burden of cotinine was in children not exposed to any of the sources we asked about.The correlation between cotinine concentrations in such children and the prevalence of smoking in the community suggests that passive smoking should be viewed as a community exposure rather than simply as an aspect of family lifestyle.
Simons et al. (Sat,) studied this question.