Within Orford''s (2001) model of addiction, a person''s emotional attachment to a substance (drug) or activity (e.g., gambling) is considered a central aspect of developing an addiction to that substance or activity. The aim of this book is to determine how emotional attachment to a substance manifests behaviourally, cognitively, and emotionally so that an operational definition of emotional attachment can be constructed. Data were collected via semi-structured interviews and analysed using Creswell''s (2003) thematic content analysis. The 23 cognitive and emotional themes that were detected appear to be central to defining attachment to a substance, whereas the 16 behavioural manifestations are difficult to distinguish from standard indicators of dependence. Consequently, a measure of attachment to a substance should focus on the emotional and cognitive aspects in order that it not be confounded with measures of dependence.