The Japanese verbal noun '禁煙 (きんえん)' means 'no smoking' or 'smoking prohibition'. It is commonly used to indicate areas where smoking is not allowed, such as in public spaces, restaurants, or on public transportation. This term is often seen on signs and notices. For example: This is a no-smoking area「ここは禁煙です」(ここはきんえんです). Please refrain from smoking「禁煙をお願いします」(きんえんをおねがいします). The term can also be used in a broader sense to refer to the act of quitting smoking, as in '禁煙する (きんえんする)' which means 'to quit smoking'.