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Addiction (Depressants: Are psychoactive drugs that slow down the activity…
Addiction is a physical or psychological dependence on drugs or substances, a complex condition, brain disease is manifested by compulsive substance use despite harmful consequence. People with addiction have an intense focus on using a certain substance(s), alcohol or drugs, to the point that it takes over their life. They know it will cause problems.
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Neurological: in a neurological addiction we can avoid concussions traumatic injuries to our brain that can lead to neurological problems.Scientists study the effects that drugs have on the brain and on people’s behavior. They use this information to develop programs for
preventing drug abuse and for helping people recover from addiction. 
Psicological : When you consume drugs you can't stop take them. For example, a person who drinks alcohol heavily on a night out may experience both the euphoric and harmful effects of the substance. When a person has an addiction, and they stop taking the substance or engaging in the behavior, they may experience certain symptoms.
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Depressants: Are psychoactive drugs that slow down the activity of the central nervous system (the brain and spinal cord), which reduces a person's alertness, and also slows down functions such as breathing and heart rate. These can take the form of pharmaceutical drugs as well as illicit substances. Alcohol is also a widely used depressant.
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Cannabis. Mull, Pot,, Marijuana.
Ecstasy. Pingers, E's, Pills, Xtc, Eccies, Bickies.
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Physical consecuences
All drugs–nicotine, cocaine, marijuana and others–affect the brain’s “reward” circuit, which is part of the limbic system. This area of the brain affects instinct and mood. Drugs target this system, which causes large amounts of dopamine—a brain chemical that helps regulate emotions and feelings of pleasure—to flood the brain. This flood of dopamine is what causes a “high.” It’s one of the main causes of drug addiction.