smoking
1 n-uncount Smoking is the act or habit of smoking cigarettes, cigars, or a pipe.
Smoking is now banned in many places of work.
2 adj A smoking area is intended for people who want to smoke.
...the decision to scrap smoking compartments on Kent trains.
3
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smoke
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passive smoking
non-smoking , nonsmoking
1 adj A non-smoking area in a public place is an area in which people are not allowed to smoke., (Antonym: smoking)
More and more restaurants are providing non-smoking areas.
2 adj A non-smoking person is a person who does not smoke.
The fertility of women who smoke is half that of non-smoking women.
passive smoking
Passive smoking involves breathing in the smoke from other people's cigarettes because you happen to be near them. n-uncount
...the dangers of passive smoking.
smoking gun (smoking guns plural )A smoking gun is a piece of evidence that proves that something is true or that someone is responsible for a crime.
(mainly AM or, JOURNALISM) n-count
The search for other kinds of evidence tying him to trafficking has not produced a smoking gun.