Figure 1

Study schematic detailing study visit procedures, order of testing and structure of protocol in smoking subjects vs. healthy nonsmoking controls. BH4, tetrahydrobiopterin; FMD, flow-mediated dilation.

Study schematic detailing study visit procedures, order of testing and structure of protocol in smoking subjects vs. healthy nonsmoking controls. BH4, tetrahydrobiopterin; FMD, flow-mediated dilation.