Catalyzes the oxygenation of a variety of substrates, including ethanol and procarcinogens such as N-nitrosodiethylamine and phenacetin. Exhibits a high coumarin 7-hydroxylase activity. Converts also testosterone to androstenedione. an organic molecule + O2 + reduced [NADPH--hemoprotein reductase] = an alcohol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Expressed in liver and lung as well as in nasal tissues. Belongs to the cytochrome P450 family.