Abstract
Human olfaction is known to have regressed and it is now far inferior to the that of other mammals. The author ascribed the regression to hominization and urbanization in the process of human development. It is speculated that the regression of olfaction began in the primate stage and acutely retrogressed during the urbanization of Homosapiens. Modern culture, abuse of olfaction or decadence of man might have contributed to the regression. The process of such regression in biological activity may evolve in the human sex in the future.
