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Two-fold Nature

Drug rehabilitation tends to address the stated twofold nature of drug dependency: physical and psychological dependency. Physical dependency involves a detoxification process to cope with withdrawal symptoms from regular use of the drug. With regular use of many drugs, legal or otherwise, the brain gradually adapts to the presence of the drug so that the desired effect is minimal. Apparently normal functioning of the user may be observed, despite being under the influence of the drug. This is how physical develops tolerance to drugs such as Marijuana, heroin, amphetamines, cocaine, nicotine or alcohol. It also explains why more of the drug is needed to get the same effect with regular use. The abrupt cessation of taking a drug can lead to withdrawal symptoms where the body may take weeks or months (depending on the drug involved) to return to normal.

[edit] Psychological dependency

Psychological dependency is addressed in many drug rehabilitation programs by attempting to teach the patient new methods of interacting in a drug-free environment. In particular, patients are generally encouraged or required not to associate with friends who still use the addictive substance. Twelve-step programs encourage addicts not only to stop using alcohol or other drugs, but to examine and change habits related to their addictions. Many programs emphasize that recovery is a permanent process without culmination. For legal drugs such as alcohol, complete abstention, rather than attempts at moderation, which may lead to relapse-is also emphasized ( "One drink is too many; one hundred drinks is not enough.") Whether moderation is achievable by those with the history of abuse remains a controversial point but is generally considered unsustainable.