Secondhand Smoke May Harm Children's Kidneys.

The findings of a new study support the possibility that exposure to tobacco – among active smokers and those exposed to secondhand smoke – affects kidney function beginning in childhood. In blood tests of creatinine and cotinine (a chemical found in tobacco), adolescents' eGFR decreased inversely to the cotinine concentration in their blood, according to a recentPediatrics study. The analyses were done on 7516 teens who were participants in the 1999–2010 National Health and Nutrition Examination Survey.