smoking
US /ˈsmoʊ.kɪŋ/
UK /ˈsmoʊ.kɪŋ/

1.
the action or habit of inhaling and exhaling the smoke of tobacco or a drug
:
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Smoking is prohibited in this building.
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He quit smoking last year.
1.
emitting smoke or visible vapor
:
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The chimney was smoking heavily.
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The engine started smoking after a few miles.
1.
present participle of smoke
:
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He was caught smoking in the non-smoking area.
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The fire was still smoking hours later.