Under FAA Part 91 regulations (which govern private, non-commercial flights), there is no explicit federal ban on smoking in your own aircraft in 2026. The decision rests entirely with the aircraft owner. However, in practice, smoking is extremely rare even in private aviation due to the "hidden costs." Smoke residue settles into porous leather, headliners, and carpets, causing "permanent" odors and potentially decreasing the plane's resale value by tens of thousands of dollars. Furthermore, smoke can damage sensitive avionics and air filtration systems, and the "Pilot in Command" has the ultimate authority to ban it if they believe it poses a safety risk (such as fire or distraction). While legally possible, most private owners and charter operators maintain strict "No Smoking" policies to preserve the aircraft's integrity and air quality.