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Figure 1 Time course of platelet aggregations in subjects who quit smoking (group A, open bars) and subjects who resumed smoking (group B, solid bars). Note that platelet aggregations were time-dependently decreased after smoking cessation; however, in the subjects who resumed smoking, platelet aggregations returned to the baseline values by resmoking. *p < 0.01 vs. day 0 in group A; p < 0.05 vs. day 0 in group B; p < 0.05 vs. day 14 in group B. ADP = adenosine diphosphate.