Definition of smoking noun from the Oxford Advanced American Dictionary

  

smoking

 noun
noun
NAmE//ˈsmoʊkɪŋ//
 
[uncountable]
 
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 the activity or habit of smoking cigarettes, etc. No Smoking (= for example, on a notice) Would you like smoking or nonsmoking? (= for example in a restaurant) Smoking is not allowed in this theater. He's trying to give up smoking. compare nonsmoking
See the Oxford Advanced Learner's Dictionary entry: smoking