1. Smoking not permitted
   - nonsmoking, non-smoking

Encyclopedia: No smoking

• introject
• introjected
• introjection
• intromission
• intromit
• intron
• Intropin
• introrse
• introspect
• introspection
• introspective
• introspectively
• introspectiveness
• introuvable
• introversion
• introversive
• introvert
• introverted
• introvertish
• introvertive
• intrude
• intrude on
• intruder
• intruding
• intrusion