On December 8, 2015, researchers at Harvard University announced that they had examined a small sample of flavored e-cigarette products and found that some contained diacetyl, a chemical suspected of causing respiratory illness. In the wake of this announcement, some news organizations reported that the Harvard paper established a “link” between e-cigarettes and bronchiolitis obliterans, a disease associated with diacetyl exposure.

But the Harvard study did not discuss any connection between diacetyl in e-cigarettes and respiratory illness. The researchers merely noted the presence of diacetyl in e-cigarettes and that diacetyl has been associated with respiratory disease in the industrial context. The study drew no conclusions about the possible health risks that vaping poses to consumers. Instead, the study’s authors recommended that this new potential source of exposure to diacetyl be further evaluated.
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