禁煙（きんえん、kineん）
- no smoking

The Japanese word 禁煙, きんえん, means "no smoking," "non-smoking," or "smoking prohibited." It is a compound word that indicates the prohibition of smoking in a specific area, building, or situation. It's a very common sign and a crucial part of Japanese public etiquette. It can also refer to the act of quitting smoking.

⚫︎ このレストランは禁煙です。 Translation: This restaurant is non-smoking. ⚫︎ 禁煙席をご希望ですか？ Translation: Would you like a non-smoking seat? ⚫︎ 今日から禁煙します！ Translation: I will quit smoking from today!

You use 禁煙 when: ⚫︎ Describing a place where smoking is not allowed. ⚫︎ Talking about the regulations or rules regarding smoking. ⚫︎ Expressing your decision to quit smoking. ⚫︎ Asking someone if a space is non-smoking. ⚫︎ Referencing signs indicating no smoking.

禁煙 is typically written with kanji 禁 (kin, meaning "prohibition" or "ban") and 煙 (en, meaning "smoke"). The reading is きんえん in hiragana. There are no other common ways to write this. The okurigana is standard, with no variations.

While not direct synonyms, the following phrases relate to the concept of not smoking: ⚫︎ 喫煙禁止 (kitsuen kinshi): "Smoking prohibited" (formal) ⚫︎ たばこ禁止 (tabako kinshi): "Tobacco prohibited" ⚫︎ 禁煙席 (kin'en seki): "Non-smoking seat"

The antonym of 禁煙 could be considered: ⚫︎ 喫煙可 (kitsuen ka): "Smoking allowed" ⚫︎ 喫煙所 (kitsuen jo): "Smoking area" ⚫︎ 喫煙席 (kitsuen seki): "Smoking seat"

駅のホームは禁煙です。 ・Translation: The train platform is non-smoking. ・Explanation: This sentence informs you that smoking is not allowed on the train platform.

健康のために禁煙することにしました。 ・Translation: I decided to quit smoking for my health. ・Explanation: This sentence explains the reason behind the decision to quit smoking.

The word 禁煙 is a combination of two kanji: 禁 (kin), which implies prohibition or a ban, and 煙 (en), which refers to smoke. It reflects a modern understanding of the health risks associated with smoking and the need to regulate it in public spaces.