This paper defends a stuff theory of the chemical senses: smell and taste, unlike vision, touch, and hearing, are directly oriented toward stuffs rather than individual objects. I first argue that stuff constitutes an irreducible ontological category — distinct from both individuals and universals. I then contend, drawing on recent anti-reductionist work in the philosophy of chemistry, that chemistry itself is best understood as a science of stuffs rather than of atoms or molecules. Finally, building on my earlier work (Mizrahi 2014), I show that the distinctive phenomenology of smell and taste — including mixture, concentration, and the sense of presence — is best explained by a stuff theory of their proper objects. The paper concludes by considering the implications of this view for the long-standing question of how to individuate the senses of smell and taste.