Final answer:
Addiction is the condition where the brain develops a chemical need for a drug and cannot function normally without it.
Step-by-step explanation:
The condition described in the question is addiction. Addiction occurs when the brain develops a chemical need for a drug and cannot function normally without it. It is characterized by compulsive drug-seeking behavior despite the negative consequences it may have on a person's health, relationships, and daily life. Addiction can develop to various substances, such as alcohol, drugs, or even certain medications.
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