Well it’s difficult to say. I had a bun that got aspiration pneumonia after having nearly choked on a pellet. I did the bunny Heimlich and all and he was “fine” after -but he developped pneumonia later. The pneumonia was successfully treated with a 2 week course of Bactrim (antibiotic). The only symptom I noticed was that he made a sort of twittering noise when he got excited or when he was eating a particularly yummy treat. He was elderly though, elderly buns are of course more susceptible to infections than healthy adults.
I’d say keep a close eye (and ear!) on your bun. Appetite, poop, pee, litterbox habits, activity level etc. It is very uncommon for a healthy bun to choke on vegetables/herbs. It mainly occurs with pellets of a smaller size, which a greedy bun can happen to inhale. (To avoid this it’s a good idea to scatter the pellets around the bun’s area, so the bun has to search for the food).