Abstract
The aim of this study was to evaluate the effects of indoor smoking. Exhaled carbon monoxide (CO) concentrations were measured on a CO monitor by a vital capacity manoeuvre in three groups of adolescents: non‐smokers with non‐smoking families, non‐smokers with smoking mothers, and smokers. Each group included eight families. Smokers had higher exhaled CO (mean ± SD, 35.67 ± 14.62 ppm) than non‐smokers with smoking mothers (6 ± 2.5 ppm) and non‐smokers (2.37 ± 0.56 ppm), late in the evening (21.00h). The levels of exhaled CO in nonsmoking adolescents doubled if their mothers smoked. Conclusion: Exhaled CO can be used as an indicator of indoor smoking. Maternal smoking plays a major role in the health of adolescents.
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