Meaning of “passive smoking” in the English Dictionary

british dictionary

"passive smoking" in British English

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passive smokingnoun [ U ]

uk /ˌpæs.ɪv ˈsməʊ.kɪŋ/ us /ˌpæs.ɪv ˈsmoʊ.kɪŋ/

the unwanted breathing in of other people's cigarette smoke, especially by people who do not smoke:

Doctors say passive smoking has caused his lung cancer.

(Definition of “passive smoking” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)