AJPH First Look, published online ahead of print May 11, 2005
A Longitudinal Assessment of the Impact of Smoke-Free Worksite Policies on Tobacco Use
Joseph E. Bauer, PhD,
Andrew Hyland, PhD,
Qiang Li, MD,
Craig Steger, MA and
K. Michael Cummings, PhD, MPH
The authors are with the Department of Health Behavior, Division of Cancer Prevention and Population Sciences, Roswell Park Cancer Institute, Buffalo, NY.

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FIGURE 1— Changes over time in worksite smoking policies: Community Intervention Trial for Smoking Cessation cohort, 1993 and 2001.
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Copyright © 2005 by the American Public Health Association