A Queens woman’s 16-year popcorn habit left her with permanent lung damage, a lawsuit charges.

Between 1991 and September 2007, Agnes Mercado daily devoured two to three bags of Act II Lite microwave popcorn flavored with diacetyl.

Workers who packaged the popcorn for manufacturer ConAgra Foods developed “popcorn lung,” an airway obstruction that does not respond to medicine.

The food giant dumped diacetyl from its recipe in 2007.

Mercado, just diagnosed last month, uses an oxygen tank and is “likely to require a lung transplant,” the Queens Supreme Court suit against ConAgra says.