What is the appropriate response if a passenger is suspected of smoking in the lavatory?

The appropriate response if a passenger is suspected of smoking in the lavatory is to extinguish materials in the ashtray outside. This action is crucial because it directly addresses the immediate safety concerns associated with smoking on board, particularly in a lavatory where there are flammable materials and the risk of fire is elevated.

By extinguishing smoking materials in the designated ashtray, flight attendants help reduce the potential hazards and maintain a safe environment for all passengers and crew. This response is aligned with safety protocols to prevent any danger that could arise from onboard smoking, which is strictly prohibited.

Taking other actions, such as confiscating smoking materials or checking the passenger's cabin, may not address the immediate situation effectively. Reporting to the authorities after landing is also necessary, but it should come after ensuring the onboard situation is secure and does not pose an immediate risk. Thus, the most effective and relevant response to a suspected in-flight smoking incident is to extinguish any smoking materials found.