smoke
n. uncountablen. the grey or white cloud that rises into the air when something burns. It can also mean the act of smoking a cigarette.
n. the visible suspension of carbon or other particles in air, typically emitted from a burning substance. In informal contexts, it may refer to the act of smoking tobacco or a cigarette itself.
The thick black smoke rose from the campfire.
The fire alarm went off because someone left a piece of bread in the toaster until it started to smoke.
Heavy plumes of industrial smoke drifted across the valley, obscuring the mountain peaks and prompting a local air quality warning for vulnerable residents.
Uncountable when referring to the atmospheric substance; countable in informal British English when referring to a cigarette ('a smoke').