here's an article from 2002
http://www.usatoday.com/money/general/2002/06/20/popcorn-factory.htmJASPER, Mo. — When the days turn humid in this farming town, the air becomes thick with the smell of butter from the Gilster-Mary Lee plant, a microwave-popcorn factory and one of the area's largest employers. At night, when the buildings' lights are ablaze, some residents say they've seen a yellowish cloud emanate from the building and fill the dark sky. For years, no one here complained much about the odor or the fumes, figuring those were harmless prices to pay for prosperity. But a growing number of workers say the cause of that aroma is destroying their lungs. Some former workers are afflicted with a rare lung disease believed to be caused by inhaling a substance never suspected as an on-the-job hazard: the butter flavoring in microwave popcorn.
The national Centers for Disease Control and Prevention (CDC), which has dispatched investigators here and to similar plants elsewhere in the country, suspects this might be a new occupational illness that could be afflicting employees at other food plants nationwide.
This is a behind-the-scenes look at the federal investigators' search for a potential new workplace disease — dubbed Popcorn Packers' Lung by the doctors who first identified these cases.
The disease is lethal and irreversible, doctors say. At least 30 former employees at the plant here have severe breathing problems, and nearly all may eventually need new lungs, according to a lawsuit filed by workers and lawyers on the case. Four have been accepted on lung transplant lists, and doctors say some are functioning on less than a third of a working lung.
...more...
it's appalling that it has taken this long to get anyone's attention to the problem.