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(CNN) — This summer, a group of University of Kentucky students and staff has been patrolling campus grounds — scouting out any student, employee or visitor lighting a cigarette.

Unlike hall monitors who cite students for bad behavior, the Tobacco-free Take Action! volunteers approach smokers, respectfully ask them to dispose of the cigarette and provide information about quit-smoking resources available on campus.

The University of Kentucky is one of more than 500 college campuses across the country that have enacted 100% smoke-free or tobacco-free policies as of July 1. Although policy enforcement varies from school to school, most prohibit smoking on all campus grounds, including athletic stadiums, restaurants and parking lots.

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