having restrictions against the smoking of tobacco: a nonsmoking section of an airplane.
not using cigarettes, cigars, or other smoking materials: nonsmoking persons.
Also, non-smoking, no-smoking.

1890–95; non- + smoking Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonsmoker (nɒnˈsməʊkə)
1.  a person who does not smoke
2.  a train compartment in which smoking is forbidden

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Each room is equipped with a microwave and refrigerator, and both smoking and nonsmoking rooms are available.
All the guestrooms at this hotel are nonsmoking facilities.
Many of the rooms allow smoking, so if you want a nonsmoking room, it's best to request on during booking.
Top hotels provide nonsmoking rooms and floors, and a few restaurants have begun to set aside nonsmoking tables and sections.
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