Drugs are any substance that can be inhaled, injected, smoked, or absorbed that causes temporary or permanent physiological changes in your body. 

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Alcohol and drugs can change your brain's natural balance or homeostasis. The brain monitors homeostasis in the body to maintain a healthy system. But drugs and alcohol can end up harming your homeostasis. When you're addicted to drugs you overstimulate parts of the brain causing it to be hard for your body to balance out. 

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