Children with high levels of tobacco smoke exposure are more likely to have moderate or severe asthma, says a study conducted by the Centers for Disease Control and Prevention. While it has long been known that involuntary exposure to environmental tobacco smoke (ETS) is linked to respiratory infections, middle ear disease and asthma, this study confirms that children with asthma who are exposed to ETS are more likely to have increased respiratory symptoms, increased school absences and decreased lung function.
The study, which is reported in the August edition of CHEST, the peer-reviewed journal of the American College of Chest Physicians, looked at 523 children aged four through 16 years who had physician-diagnosed asthma.
Using the biomarker cotinine, a nicotine metabolite that accumulates in the blood and urine following tobacco smoke inhalation, children were classified into ETS exposure groups to determine the indicators of asthma severity among children with high and low levels of tobacco smoke exposure.
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