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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.
People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
There are more sensory neurons in the tongue than in any other part of the body.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.