Not everything related to school starts in September.

On Aug. 12, Northeastern joined more than 1,100 U.S. colleges and universities that have cleared the air on their campuses: Northeastern is now smoke-free.

The new policy bans students, faculty, staff, and visitors from smoking anywhere on Northeastern’s properties in Boston and throughout Massachusetts, as well as on its graduate campuses in Charlotte, N.C., and Seattle, including outdoor areas.

Tobacco use is among the leading causes of preventable disease, disability, and death in America. And the U.S. Surgeon General has warned that no level of smoking is safe. Current national statistics indicate that about 15 percent of college students smoke—about half of them on a daily basis.

Policies establishing smoke-free environments have been shown to cut exposure to secondhand smoke and reduce daily cigarette consumption. To help students, faculty, and staff break the habit, the university offers smoking-cessation services.

Northeastern’s policy was adopted after considerable input and support from the university community.