A study published in Environmental Health Perspectives found the presence of diacetyl, a buttery-tasting flavoring chemical linked to lung disease, in more than 75 percent of flavored electronic cigarette and refill liquids tested. Many of the tested flavors containing diacetyl were also found to contain two additional chemicals designated by the Flavor and Extract Manufacturers Association as respiratory hazards in the workplace. Diacetyl first became infamous in the early 2000s, when workers in microwave popcorn processing facilities were diagnosed with a serious obstructive lung disease known as bronchiolitis obliterans. … Read More