Photo credit: Malingering
We now know that chronic exposure to diacetyl, the artificial-flavoring chemical in microwavable popcorn, causes a debilitating and sometimes-fatal lung disease known as bronchiolitis obliterans, or "popcorn lungs." But what's an armchair cinephile with a jonesing for lightly puffed snacks to do?
It actually couldn't be easier (or less inexpensive) to make your own at home, using popcorn kernels you might find in the bulk-foods section of your grocery store. Place a serving of kernels into a brown paper bag, smear some butter on the inside of the bag facing upward, fluff out the bag and fold it over thrice, and then nuke that baby in the microwave on high for 4 minutes.
You can even reuse the bag if you slather on the butter after your popcorn is ready. ::Instructables