乘客在飞机的厕所里抽烟，烟头点燃了垃圾桶，客舱弥漫着有毒的浓烟……

Core Viewpoint - The history of smoking bans on airplanes is relatively short and has resulted from collective efforts and tragic incidents over the years [1] Group 1: Historical Context of Smoking on Airplanes - In the early days of civil aviation, smoking was common and even encouraged on flights, with passengers often dressing up and socializing while smoking [2] - Initially, airlines designated smoking and non-smoking areas, but awareness of the health risks associated with smoking and secondhand smoke was limited [4][5] - A significant portion of passengers, sometimes over one-third, smoked during flights, leading to a pervasive smoke-filled environment [4][6] Group 2: Health Risks and Incidents - Flight attendants faced severe health risks due to exposure to secondhand smoke, including respiratory issues and increased cancer risks [6] - Notable incidents, such as the Varig Flight 820 disaster in 1973, highlighted the dangers of in-flight smoking, resulting in 123 fatalities due to a fire caused by a discarded cigarette [8][10] - Another tragic event involved a domestic flight in China in 1982, where a cigarette caused a fire that led to the deaths of 25 passengers [12] Group 3: Implementation of Smoking Bans - China became one of the first countries to implement a smoking ban on flights in 1983, with further restrictions on international flights announced in 1993 [12] - By 2017, regulations were established to prohibit smoking in the cockpit, with a two-year grace period for compliance [16] Group 4: Current Regulations and Violations - Despite the established bans, incidents of passengers attempting to smoke on flights still occur, leading to legal consequences [15][21] - Airplanes are equipped with smoke detectors and signs indicating a no-smoking policy, yet ashtrays are still present in lavatories as a precautionary measure [22][24]