In the DSM-IV-TR, substance-related disorders are ...

In the DSM-IV-TR, substance-related disorders are divided into depressants
(alcohol, barbiturates, and benzodiazepines), stimulants (amphetamine, cocaine,
nicotine, and caffeine), opiates (heroin, codeine, and morphine), and
hallucinogens (marijuana and LSD).  Specific diagnoses are further categorized
as substance dependence, substance abuse, substance intoxication, and substance
withdrawal.

Provide a brief definition of addiction, in your own words.
What are the similarities and differences in the levels of involvement in the
following substance-related stages of addiction: use, intoxication, abuse, and
dependence?  Discuss why people continue to use substances, despite negative
consequences


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