The San Francisco Department of Public Health launched an educational e-cigarette campaign in January called #CurbIt. The campaign, which includes bus ads (like the one above), was designed to increase awareness of the city’s policy that prohibits e-cigarette use in places where smoking already is not allowed, says Derek Smith, a health educator with the department’s Tobacco Free Project.

San Francisco is one of several large cities—including Chicago, Los Angeles, New York and Philadelphia—that passed an ordinance in 2014 restricting use of e-cigarettes in public places. San Francisco has long been a leader in tobacco control legislation, says Smith, and with #CurbIt, “we are the first city to develop an educational campaign that aims to increase awareness about potential harms associated with e-cigarettes.”