An anonymous reader quotes a report from Live Science: Most American teenagers who abuse opioid drugs first received the drugs from a doctor, a new study finds. Researchers looked at trends in the use of prescription opioids among U.S. adolescents from 1976 to 2015. They found a strong correlation between teens' taking the drugs for medical reasons and then later taking them for "non-medical" reasons, or in other words, abusing them, according to the study published today (March 20) in the journal Pediatrics. In 2015, the the most recent year of the study, 8 percent of adolescents reported abusing prescription opioids, and the majority of them had been prescribed opioids previously, the researchers found. The U.S. consumes about 80 percent of the world's prescription opioid supply. There has been consistent growth in the number of prescriptions written for opioids in the U.S., rising from 76 million prescriptions in 1991 to 207 million in 2013, according to the National Institute on Drug Abuse. However, the new study revealed that among teens, both medical and non-medical use of opioid medications has declined in recent years, starting in 2013. The decline may be due to careful prescribing practices, Sean McCabe, a research professor at the University of Michigan, said. There are several medical procedures that teens may undergo for which opioids are recommended for pain management. But doctors can be careful about the amount of these drugs they prescribe, and limit refills. Parents can make sure that any leftover pills are discarded. Another report was published today in the journal Pediatrics that analyzed data from the National Poison Data System. It found that of all 188,468 prescription opioid exposures reported for youth under 20 years old between 2000 and 2015, nearly all the exposures occurred at a home and were most common among children under 5, accounting for six of every 10 cases. According to NPR, those children were able to get their hands on the medication because it was improperly stored or was in a purse.