In a case–control study of 346 subjects with and without COPD, Vibhuti et al. examined the polymorphisms of 462Ile/Val, 3801T/C of CYP1A1, −3860G/A of CYP1A2, and −930A/G, 242C/T of CYBA individually and reported that CYP1A1, CYP1A2, and CYBA gene polymorphisms are associated with oxidative stress in COPD [112]. This evidence concerns the gene CYP1A2 and chronic obstructive pulmonary disease.