Secondhand smoke visibly damaging to kids | MNN - Mother Nature Network.
Finnish researchers have found that the damage caused by secondhand tobacco smoke starts in childhood and causes measurable damage by the teen years. Children as young as 13 who have evidence of secondhand smoke in their blood also have visibly thicker arteries. For the study, researchers studied 494 children aged 8 to 13 taking part in ongoing research on heart disease. They measured levels of cotinine, a byproduct of nicotine that is found in the blood after someone breathes in tobacco smoke.
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