Final answer:
Addiction is a physical need for a substance that causes the brain's structure and function to change. It is considered a chronic disease and involves tolerance.
Step-by-step explanation:
The subject of this question is Addiction, which is a physical need for a substance that causes the brain's structure and function to change. Addiction can be seen as a chronic disease because it persists over time, and it also involves tolerance, where a person needs larger amounts of the substance to achieve the same effect. In terms of physical wellness, it is essential to understand the dangers of addiction and the impact it can have on both the body and the mind.
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