Health officials say they have more evidence that a certain chemical compound is a culprit in a national outbreak of vaping illnesses.

A study released Tuesday analyzed vaping cartridges gathered in Minnesota during the outbreak this year and cartridges seized in that state last year. The newer cartridges contained the compound vitamin E acetate, but none of the older ones did.

The study was small and included just a few dozen products. But the finding echoes another study that found the compound in the damaged lungs of 29 patients across the country.

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