Addiction to drugs refers to an uncontrollable desire to use the drug, which is the addictive substance, regardless of the negative results of such an experience. Earlier notions of drug or substance addiction were solely based on alcohol, but there are other addictive substances that are abused today, including heroin, cocaine, tobacco, methadone etc. There are many addictive substances which are addictive for humans and generally have a negative impact on human health and the society. It is, therefore, important to understand and be able to treat addiction and formulate strategies for the control of drugs in the society (Government of Northwest Territories, 2004).
The mechanism of addiction has been investigated by many researchers and various models related to substance addiction in humans have been presented. The important models which attempt to explain substance addiction in humans include the disease model, socio-cultural model, mental health model, biopsychosocial model, the general systems or family model as well as other attempts to explain the phenomenon (Nady, 1998).
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