The cat sneezed for 15 minutes straight, according to redditor withagecomesnerdines. Then he finally found a clue as to her troubles. A tiny patch of green in her nose. It was a blade of grass! So he pulled it out.
My goodness. That had to be a relief for the poor cat. The joke, of course, is that you're not supposed to snort grass, you're supposed to smoke it. Others have speculated that the cat was probably eating the grass, but instead of going down to her stomach, the blade went up into her nasal cavity. She's all better now. If your cat won't stop sneezing, you might want to look in its nose.