Why do people do things which can often cause great personal harm even when they know this to be the case? Chaos and Intoxication examines this question and presents a detailed discussion of the chaotic nature of human existence, first exploring three general areas, then bringing them together to develop a general theory of chaos and human nature. The first, neurobiology and genetics, allows the evolution of the mind to be examined from a Darwinian perspective, highlighting the way development is structured by natural selection.The second theme, cognition and collective action, is considered in light of evidence indicating that the way we think is also subject to natural selection. Furthermore, it is argued there is a meaningful distinction between reason and rationality. This book will be essential reading for students of social policy, anthropology and sociology as well as professionals working in drug and alcohol support services.