Definition: the grey or black gas that is produced when something burns Level: B1
她若有所思地往后靠，向空中吹了一口烟。
She leaned back thoughtfully and blew a puff of ___smoke into the air.
房间里残留着香烟的气味。
The smell of cigarette ___smoke lingered in the room.
我讨厌烟！
I hate ___smoke!
