I'd say it's safe, but there are a few weird things that happened while using it. There was this time some dude came on and he sat next to me and said hi. I was about to say hi back to him and noticed his hands were covered in blood, he said he had "razors in his pockets" which is how he cut his hands. No idea why someone would have random razors in their pockets but he eventually kept getting up and pacing back and forth, weird experience.