<p>Physician here. Nitrous oxide has a place as an anesthetic but no place else. This is drug abuse with consequences. This child needs intervention- rehab and counseling for his problems. Do NOT let him return to any school before he gets his head straightened out. Boredom may have led to fooling around et al but he needs better coping skills. Parents can do all they can but they cannot control a teen or older child. Parents are not to blame unless they become enablers instead of getting him the help he needs.</p>