It has long been known that we vary not only in our sensitivity to different smells but also in our preferences for them—the degree to which they seem pleasant or unpleasant. This variability often contains a large genetic component (Gross-Isseroff et al., 1992; Karstensen and Tommerup, 2012; Keller et al., 2007; Keller et al., 2012;...
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