Initial results: As of Feb 22, 2007, the study protocol has been completed for a total of 5 bars and 12 employees. One of the 5 bars was a voluntary smoke-free establishment. In the remaining 4 bars, smoking was allowed. Air nicotine was detected in all the bars where smoking was allowed (range 2.1 to 16.9 µg/m3). In the smoke-free bar, air nicotine concentrations were much lower (range 0.11 to 0.15 µg/m3) and close to the limit of detection. In non-smoking employees working in bars where smoking was allowed, hair nicotine ranged from 0.7 to 6.1 ng/mg, documenting that workers in smoking bars are personally exposed to tobacco smoke by others. In the smoke-free bar, hair nicotine concentrations were below the limit of detection, documenting that smoke-free bars can provide complete protection to employees from exposure to secondhand smoke.