This study examined prevalence of smoking policies and of significant smoking restrictions in a 1988 random sample of 1,528 manufacturing companies in the Seattle, Washington area, and related these characteristics to worksite size and industry type. Sixty-nine percent of companies had formal smoking policies and 85 percent regulated smoking to some degree. Workforce size was directly related to prevalence of significant smoking restrictions, but when type of industry was controlled, the linear trend in the size/prevalence relationship was sustained in only three of the 18 industry groupings.