Addiction is purely a brain disorder and not behavioural or moral issue. Continues exposure to addictive substances damages the normal functioning of the brain. Repeated use of substances damages brain's dopamine function and pre frontal cortex. Dopamine is responsible for experiencing pleasure because while releasing dopamine we experiences pleasure.Drugs mainly activate the dopamine pathway to get pleasure. Continues use of substance will reduce the release of dopamine. That way people will loose their ability to enjoy normal pleasurable events like celebrating a festival, having sex, eating delicious food etc.. So they become compelled to boos for pleasure.
Secondly our pre frontal cortex is responsible for emotions, memory, intelligent and decision making. Repeated use of substances damages the function of pre frontal cortex and the brain will shut down the function of pre frontal cortex. So addicts will loose their memory, intelligence, proper emotions and capacity to make decision.
Our brain has tremendous capacity to repair the damaged areas. Brain will take 60 to 90 days to repair the damages. If an addicts brain is not fully recovers their emotions will not be proper, they can't enjoy normal pleasurable events, they can't make proper decision, etc.. So taking 90 days treatment helps the brain to recover and that enables a person to enjoy life as like a normal individual. If discontinue the treatment higher the chances of relapse.
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