Fig. 2

Weekly enrollment data from two work sites with different tobacco policies. The main work site data and events are in black: annual deadlines for obtaining an insurance discount by enrolling in a smoking cessation program like Call-2-Quit generated enrollment spikes in the first two years of the quitline. The secondary work site, in gray, became smoke free on April 2, 2007, without changing interest in the program. Over the course of the program, a similar, small fraction of the smokers at each of the two work sites enrolled each year