What does "non-smoker" mean?

Somebody who does not smoke tobacco.

What is a synonym for "non-smoker"?

Common synonyms include: nonsmoking.

noun

noun ·3 syllables ·Rare ·Advanced level

Noun

1
Somebody who does not smoke tobacco.
"The smaller saloon is reserved for non-smokers in both cases."
2
A railway carriage where smoking tobacco is not permitted.

"Despite being a non-smoker, he still got lung cancer."

From non- + smoker.