smokeless
adjective uk/ˈsməʊk.ləs/ us/ˈsmoʊk.ləs/
UK无烟的，不冒烟的
not causing or allowing smoke
If you live in a smokeless zone you have to use smokeless fuels instead of coal. 如果你生活在无烟区，你得使用无烟燃料，不能用煤炭。
smokeless tobaccoUS （可放在口中咀嚼的）无烟烟草
tobacco that is chewed or put in the mouth