煙
エン, けむ.る, けむり, けむ.い, たば
smoke
JLPT3 G7 S13 F1290
The relevant oracle bone form of 垔 shows a potter's wheel to which clay adheres in the potterymaking process. 煙 is as per 垔# (adhere) + 火 fire → *smoke* that adheres to walls and ceilings → *soot*; *fumes*; *smoky*; *dimly visible*.
[Full Kanji Etymology List]