The author is thinking with Deleuze's ethical practice of "being on the lookout" for encounters with the cracks. Drawing on research in the USA on access to health care for people who use illicit drugs, the author works with Deleuze and Guattari, Deleuze and Foucault in a geological and genealogical mode of inquiry to investigate the preoccupation over whether addiction is a disease or a moral failing, raising questions about the modes of subjectivation produced by these designations. The author works through a series of encounters, entering into the cracks, where things are already breaking up to unhinge thinking from usual habits to consider what our explanations of addiction produce and to chart different territory, creating different possibilities for insight and action. (Contains 12 notes.)