#4. Popcorn Lung
A rare, life-threatening lung disease that can be caused by inhaling
diacetyl, a chemical used in butter flavoring. It's normally not a
problem if a) you don't work in a microwave-popcorn factory or b)you're
not Colorado resident Wayne Watson, who ate approximately two bags of
microwave popcorn a day for 10 years and became the first-known consumer to
develop the disease. In September, as word of Watson's condition prompted
the FDA to investigate diacetyl, ConAgra — the nation's largest
microwave-popcorn produce — vowed to remove the food additive from its
products.