i-adjective
Describes an environment or air that is filled with smoke, making it uncomfortable for the eyes and breathing. Also used figuratively for a tense or awkward atmosphere.
部屋が煙くて目が痛い。
The room is smoky and my eyes hurt.
たばこの煙で煙い。
It's smoky from cigarette smoke.
Standard kanji spelling.
Kana spelling is common in everyday writing.
Rare variant kanji form.
煙たい is a synonym with the same meaning, but 煙い is slightly more common in everyday speech.
Derived from 煙 (kemuri, 'smoke') + い (adjective-forming suffix). The reading けぶい is an older form.