根本沒點火的菸草
前一組是「燒了卻沒有煙」，這一組又往前退一步：連燒都沒燒。既然沒有點火，自然沒有煙，所以英文照樣用 smokeless 來標示它。
adjective · B2
Smokeless tobacco is tobacco that is put in the mouth and chewed or held there, instead of being burned and breathed in as smoke.
無菸菸草（嚼食用）
核心畫面
You can think of -less as a hole where something should be. Put it on smoke, and the picture is a fire, a stove, or a whole street where the smoke you expect to see simply is not rising. Everything else stays: the heat, the burning, the tobacco. Only the smoke is missing.
可以把 -less 想成「本來該有的東西留下的一個缺口」。把它接在 smoke 後面，畫面就是：火照樣燒、爐子照樣熱…更多收起
可以把 -less 想成「本來該有的東西留下的一個缺口」。把它接在 smoke 後面，畫面就是：火照樣燒、爐子照樣熱、菸草照樣在，唯獨那道你預期會升起的煙沒有出現。smokeless 指的一直是這個缺口本身，而不是「乾淨」或「安全」——那些是另外要說的事。From the word’s history
Wiktionary derives smokeless from smoke + -less, with -less going back through Middle English -les to Old English -leas, meaning without.
Wiktionary 記載 smokeless 由 smoke 加 -less 構成，-less 經中古英語 -les 上溯到古英語 -lēas，意思就是「沒有」。這條線索正好對上今天的用法：這個字從頭到尾都在講「少了煙」。
Wiktionary entry for smokeless, packet source_ref kaikki:3f6f69a190036ae4:825519731
From the picture
Also in this word
adjective · B2
Burning without making smoke, or having no smoke in it. It is used about fires, stoves, engines and other things that burn, and also about a place or the air in a place where there is no smoke.
無煙的
adjective · B2
Smokeless coal or smokeless fuel is coal or another fuel that has been treated so that it burns without giving off smoke, and it is used in places where ordinary coal smoke is not allowed.
無煙煤／無煙燃料