No, rental cars generally do not have smoke detectors. While commercial airplanes, buses, and trains are federally mandated to have them, the same regulations do not apply to passenger vehicles. The primary fire safety feature in any modern car, including rentals, is the built-in ashtray and cigarette lighter (in older models) or the complete designation as a smoke-free vehicle in newer fleets.
Rental companies prioritize a smoke-free environment for future customers and to avoid damage. Smoking in a rental car is almost always a violation of the rental agreement. If you are caught, you will likely face a hefty cleaning fee, which can range from $250 to over $500, depending on the company and the extent of the odor and residue. This fee covers deep cleaning of the upholstery, headliner, and ventilation system to remove the smell for the next renter.
The absence of a smoke detector doesn't mean fire safety is ignored. All rental cars are required to have functioning safety equipment like seat belts and airbags. The most significant fire risks in a vehicle are typically related to electrical faults or engine issues, which are monitored by the car's own diagnostic systems, not a standalone smoke alarm. Your best practice is to treat the rental car as you would your own or, if you are a smoker, to plan for stops where you can smoke outside the vehicle to avoid any penalties.
