Exhibits a high coumarin 7-hydroxylase activity. Can act in the hydroxylation of the anti-cancer drugs cyclophosphamide and ifosphamide. Competent in the metabolic activation of aflatoxin B1. Constitutes the major nicotine C-oxidase. Acts as a 1,4-cineole 2-exo-monooxygenase. Possesses low phenacetin O-deethylation activity. 1,4-cineole + O2 + reduced [NADPH--hemoprotein reductase] = 2-exo-hydroxy-1,4-cineole + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Liver. By phenobarbital and dexamethasone. Belongs to the cytochrome P450 family. Numerous conflicts and frameshifts. CYP2A6 alleles CYP2A6 entry