Microwave popcorn companies, such as Act II and Orville Redenbacher, add the chemical, Diacetyl, to their popcorn for "buttery" flavor. The manufacturer of these popcorns, ConAgra Foods, announced it would remove diacetyl from its popcorn because of the risk to workers being exposed to diacetyl. In addition to workers suffering from lung ailments due to exposure, Denver doctors believe that...