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Lower log hair nicotine levels were found in BPD children of caregivers who reported no smoking in the household compared with caregivers that reported 1, 2, or ≥ 3 smokers in the household. There was a positive association between the number of smokers residing in a household and higher log nicotine level by unadjusted linear regression (P < .001 for all 117 subjects and P = .002 for the 24 households reporting smokers in the home).
