IPA: //nɒnˈsmoʊkɪŋ//
KK: /nɑnˈsmoʊkɪŋ/
Referring to areas or people that do not allow or engage in smoking tobacco.
The restaurant has a nonsmoking section for guests who prefer to avoid smoke.
Nonsmoking → It is formed from "non-" (meaning not) and "smoking" (from the verb "smoke", which comes from Old English "smocian", meaning to emit smoke). The word "nonsmoking" refers to the state of not engaging in the act of smoking.
Think of 'non-' meaning 'not' and 'smoking' as the act of emitting smoke — so nonsmoking means not engaging in smoking.