Safety

Hey all! I've been looking at purchasing my very first 1W and really can't get a read on how safe or unsafe they are. Mostly my parents are worried about it because one of my friends slipped off his and got a concussion. I'm 17 and honestly would rather live life to the fullest then just sit inside so the safety isn't really worrying me. It would be helpful if anyone had any articles that could really show how dangerous they are or compare them to skiing or something. Thanks!