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As the researchers on the new study put it, Due to the associations between diacetyl, bronchiolitis obliterans and other severe respiratory diseases among workers inhaling heated vapors containing diacetyl, urgent action is recommended to further evaluate the extent of this new exposure to diacetyl and related flavoring compounds in e-cigarettes. You can read all about the science of e-cigarettes here.

tobacco is responsible for about one in every five American deaths

Bloomberg, the former New York City mayor who is CEO of Bloomberg Philanthropies, called the move "an important step forward for public health" and said it should embolden other cities and states to follow suit