IPA: //ˈnɒnˌsmoʊ.kər//
KK: /ˈnɑnˌsmoʊkər/
A person who does not smoke tobacco.
As a nonsmoker, I prefer to spend time in places where smoking is not allowed.
Nonsmoker → It is formed from "non-" (meaning not) and "smoker" (from the verb "smoke", which comes from Old English "smocian", meaning to emit smoke). The word "nonsmoker" refers to a person who does not smoke.
Think of 'non-' meaning not, and 'smoker' as someone who emits smoke. So, a nonsmoker is simply someone who does not emit smoke.