The book presents an integrative theory of hard-to-maintain behaviours, that includes hard-to-reduce or eliminate behaviours like smoking and other drug use, overconsumption of food or unsafe sex, and hard-to-sustain behaviours like exercise and sun-safe behaviours. Most of the examples come from the author's work on tobacco smoking, but it is relevant to anyone who is concerned to understand why some forms of desirable behaviour are so hard to achieve, and to those trying to help people change. It also has important implications for public health campaigns and for the development of...