Among the men, the baseline plasma vitamin C concentration was significantly higher (P = 0.04) among nonsmokers than among smokers, and the plasma 8-epi-PGF2 concentration was significantly
higher (P = 0.045) among smokers than among nonsmokers (Table 4). After daily consumption of orange juice, vitamin C concentrations increased significantly among smokers (P = 0.04) at the end of the first week, and, at the end of study, the concentration of vitamin C was 93% higher than at baseline (71.6 ± 3.9 compared with 37.1 ± 0.5 mol/L; P = 0.02). Nonsmokers also showed higher vitamin C concentrations (P = 0.045) on days 7 and 14 than at baseline. On days 7 and 14, plasma 8-epi-PGF2 concentrations among smokers were significantly (P ≤ 0.04) lower than at baseline.