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Objective
To investigate the relationship between hair nicotine levels at 15 months of age and prior parent‐reported smoking exposure, and the risk of wheezing and current asthma from 15 months to 6 years of age.
Study Design
We measured hair nicotine levels at 15 months of age in 376 of 535 infants enrolled in a prospective birth cohort in Christchurch, New Zealand. We obtained detailed information...
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