No, most of them don’t wear helmets. I sometimes feel like stopping them and give them a mom-like talking to! Funny, you see more helmets on bicyclists than scooter riders even though the scooter riders probably are at greater risk since they are more in traffic and can go faster.
Here’s a cautionary article about a student who suffered a head injury while riding a scooter with no helmet. She was hit by a slowly-turning vehicle at the edge of campus. https://www.alligator.org/news/campus/uf-alumna-gabby-recovering-after-crash/article_ed16a312-29e0-11e5-a7f4-27bd310a0323.html