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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.