There are several synonyms for the word "nonsmoking" that can be used to describe places or environments that prohibit smoking. Some alternatives include "smoke-free," "tobacco-free," "smoking prohibited," "no smoking allowed," and "cigarette-free." These terms are often used on signs or labels to indicate that smoking is not permitted in a certain area, such as hotels, restaurants, or public spaces. Additionally, the term "nonsmoker" is often used to describe someone who doesn't smoke cigarettes or other tobacco products. Using these synonyms can help promote cleaner air and a healthier environment for everyone.