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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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There are 20 feet of blood vessels in each square inch of human skin.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Illicit drug use costs the United States approximately $181 billion every year.