U.S. researchers collected blood and saliva samples from 774 1- to 16-year-olds who were treated at the hospital for asthma or severe wheezing and found that those with traces of cotinine in their blood were 1.6 times more likely to be readmitted within a year. The presence of the tobacco ingredient in the children's saliva was associated with a 2.4 times higher risk of readmission, according to the study published in the journal Pediatrics.

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