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GlossaryAddiction historically has been defined with regard solely to psychoactive substances which cross the blood-brain barrier once ingested, temporarily altering the chemical milieu of the brain. Many people, both psychology professionals and laymen, now feel that there should be accommodation made to include psychological dependency on such things as gambling, food, sex, pornography, computers, video games, internet and more, so these behaviors count as 'addictions' as well. According to the current Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), substance dependence is defined as:
"When an individual persists in use of alcohol or other drugs despite problems related to use of the substance, substance dependence may be diagnosed. Compulsive and repetitive use may result in tolerance to the effect of the drug and withdrawal symptoms when use is reduced or stopped.”