Smoky; having a lot of smoke that irritates the eyes or nose.
台所で油を焦がして部屋がとても煙い。
I burned oil in the kitchen and the room is very smoky.
タバコを吸う人が多くて居酒屋が煙い。
Because many people smoke, the izakaya is smoky.
煙いので窓を開けて換気した。
It was smoky, so I opened the window to ventilate.