They found smoke exposure associated with nearly all measures of adiposity in the children, including bigger bellies and overall fat.    

Researchers collected both parental reports of their children's smoke exposure as well as blood levels of cotinine, the major metabolite of nicotine, which is often used as a definitive test of smoking or passive smoke exposure. They also assessed levels of physical activity, which can impact fatness, sleep and diabetes risk.
They found surprisingly that passive smoke exposure did not appear to worsen breathing problems, such as snoring and short periods of not breathing while the children slept.
The study found passive smoke had an impact on cognition that was independent of fat or socioeconomic status.
The findings were published in the journal Childhood Obesity.


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