
der Nichtraucher
non-smoker
A person who does not smoke, or does not smoke habitually.
Als überzeugter Nichtraucher stört ihn der Zigarettenqualm sehr.
As a committed non-smoker, cigarette smoke bothers him a lot.
non-smoker
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non-smoker
A person who does not smoke, or does not smoke habitually.
Als überzeugter Nichtraucher stört ihn der Zigarettenqualm sehr.
As a committed non-smoker, cigarette smoke bothers him a lot.

non-smoking area
A term for an area, compartment, or room where smoking is prohibited.
Wir haben im Zug extra Plätze im Nichtraucher reserviert.
We specifically reserved seats in the non-smoking section on the train.
The word is made up of the negation prefix 'Nicht-' (non-) and the noun 'Raucher' (smoker). So it literally means a person who is not a smoker.
Mein Vater ist seit zwanzig Jahren Nichtraucher.
My father has been a non-smoker for twenty years.
The context tells you whether a person or an area is meant. If you are talking about a person and their habits, meaning 1 is meant. If it is about places such as trains, restaurants, or hotel rooms, meaning 2 is meant.
Als Nichtraucher fühle ich mich hier unwohl.
As a non-smoker, I feel uncomfortable here.
In the meaning 'Bereich' (area), 'Nichtraucher' (non-smoking) is often the first part of a compound noun. Examples are 'das Nichtraucherabteil' (non-smoking compartment), 'das Nichtraucherzimmer' (non-smoking room), or 'der Nichtraucherbereich' (non-smoking area).
Für unsere Reise buchten wir ein Nichtraucherzimmer im Hotel.
For our trip, we booked a non-smoking room at the hotel.