Behavioral changes are another common symptom. Changes in fundamental behaviors, such as punctuality and performance, can have a significant impact on an individual's career or schooling. Compulsive lying, making unreasonable demands, and secretive behavior may be exhibited by people with substance use disorder. These actions adversely affect personal relationships, resulting in increased isolation leading to feelings of paranoia and resentment toward friends and family, increasing emotional sensitivity and causing the individual to withdraw further. Altered speech patterns are often the most obvious change in behavior. Slowed and slurred speech is usually related to the use of alcohol and depressant drugs. Drugs that stimulate the central nervous system, or "uppers", generally cause speech patterns that are more rapid than normal.
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