Addiction does begin with drug abuse when an individual makes a conscious choice to use drugs, but addiction is not just a lot of drug use . Recent scientific research provides overwhelming evidence that not only do drugs interfere with normal brain functioning creating powerful feelings of pleasure, but they also have long-term effects on brain metabolism and activity. At some point, changes occur in the brain that can turn drug abuse into addiction, a chronic, relapsing illness. Those addicted to drugs suffer from a compulsive drug craving and usage and cannot quit by themselves. Treatment is necessary to end this compulsive behaviour. This book includes within its scope leading-edge research on cocaine and heroin abuse.