I have read Demon Copperhead and Flight which I think have probably been challenged. I think the main reason that books are challenged/banned is because they contain offensive language or characters, push an unpopular agenda, or are written by a controversial author. Flights could be seen as controversial as it contains offensive words and doesn’t have a main protagonist who is morally “good.” I don’t see any issues in this book that could be issues for teens. Zits is a controversial character as he is morally grey. He is kind of a crappy person who drinks, gets into fights and commits many crimes, including him shooting up a bank. These are parts of his character that can make him unlikeable and may make readers not want to continue reading as they don’t want to support the main character’s journey. Shooting people is controversial.