熏
クン, くす.べる, ふす.べる, いぶ.す, いぶ.る, くす.ぶる, くゆ.らす

smoke, fog, vapor, cure

JLPT0 G13 S0 F5000

As per 柬# (place over a fire) + 火 fire → *smoke* rising from an object being burned → *smoke* (v.); *darken*.

[Full Kanji Etymology List]