Why is it that one person can become severely dependent on drugs or alcohol, whereas another, although exposed to the same environment and experiences, does not? This book describes a series of studies that were conducted in order to examine this vulnerability to addictive behaviour. The book demonstrates how genetic variants, personality traits and responsiveness to substance- related stimuli can influence an individuals propensity toward a severe dependency on drugs. Ultimately, this book explains the importance of genetic variation in substance dependence; it advances our...