Diacetyl is an ingredient which is safe to eat but is not safe when inhaled into the lungs.
One among the many compounds that contribute to butter's signature flavour is a substance called diacetyl. Butter does contain trace amounts of these elements. In butter-flavoured popcorn, margarine, butter-flavoured cooking oils and sprays, and butter-flavoured sprays, the levels used were significantly greater. Workers at factories that produce microwave popcorn discovered the hard way that long-term exposure to diacetyl induces obstructive lung disease, which has the potential to be lethal. It is possible for diacetyl to inflict irreversible damage to the bronchioles, which are the terminal segments of the branched airways in the lungs.
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