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In general, all human attributes can be improved to various degrees, including smell. I suspect in aboriginal or privative type cultures, necessity, in terms of foraging and survival, exercise a much higher degree of sensory awareness. In modern cultures, the range of these abilities are determined by the requirements individuals are subject to. Clearly, and inexplicably, there are exceptions. It would be noteworthy to test individuals in primitive cultures to determine the range of these abilities. I find it intriguing that "modern" subject can vastly enhance their sensory capacities. Personally, I accept the need to awaken all human attributes. This would greatly improve work and survival skills. Convincing modern subjects, otherwise successful, in their chosen disciplines, as to the need and benefit of such potential enhancement seem daunting. I realize, my take does not reflect the thrust of your article; or the books referenced. At the same time, the possibility for, and benefits from sensory awakening, is, in my opinion, implied, and indicates potentials that have been stifled, and the birthright of a fully functioning human being.