This chapter interrogates the sense of breathing. The ambiguity of the word “sense,” referring at once to our perceptual and emotional entanglement with an “external” world and our personal and interpersonal translation of these contacts into an “internal” meaning, is understood, in itself, as an act of respiration. First, the essay retraces this fruitful ambiguity of breathing in the phenomenology of Martin Heidegger and Maurice Merleau-Ponty. Then, the sense of scent, inextricably connected to breathing in a double mode that we graphically represent as “sense/sense,” is explored as a still largely untapped way of making sense in our lives: we argue for this last point by reconstructing and turning over Kant’s osmophobic remarks in the third Critique and in the Anthropology.