Why are there still ashtrays on planes where smoking is prohibited?

People who like to smoke are often very sensitive to ashtrays. When I see an ashtray, I always want to take a few puffs. But why are there signs saying "No Smoking" on the plane, but ashtrays are used to show everyone's smoking addiction? Why do we need ashtrays on airplanes? Staff from the maintenance department of Jiangsu China Eastern Airlines: Ashtrays are a required safety device for aircraft. Civil aviation regulations at home and abroad have clear regulations: regardless of whether smoking is allowed in any other area of ??the aircraft, ashtrays must be placed on the entry side of each toilet door. Or a removable ashtray must be installed in a conspicuous position near it, but one ashtray can also be used by several toilet doors, as long as the ashtray can be easily seen from the side of each toilet near the cabin. In addition, restrooms must have a "No Smoking" or "No Smoking in Restrooms" placard located conspicuously on each side of the entrance door. And when encountering some stubborn smokers, flight attendants can also use ashtrays to extinguish cigarette butts to prevent fire hazards. Of course, China Eastern Airlines also asks passengers not to take chances. For your safety and health, please do not smoke on board. Xu Yuan Garden