Produces or releases smoke, or when a person uses a cigarette or pipe to inhale and exhale smoke.
From Old English 'smoca' (noun) and Germanic roots possibly related to 'smolder.' The origin may connect to 'smeuk' meaning 'vapor,' or it could be imitative of the hissing sound of smoke.
Smoke is invisible until it reaches a certain density—what you see as smoke isn't the actual combustion gases but tiny particles of ash! This is why 'where there's smoke, there's fire' became a proverb: visible smoke requires real heat underneath.
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