Drug overdoses in the U.S. are on the rise, and now one in four of them come from heroin.
A new study from the Centers for Disease Control and Prevention found that 25% of overdose deaths are from heroin, which is three times the proportion in 1999 (8%). Overall, the age-adjusted rate of drug overdose deaths in 2015 at 16.3 per 100,000 was more than 2.5 times the rate in 1999, when it was 6.1 per 100,000.
Adults between the ages of 45 and 54 had the highest rates of overdose deaths in 2015, and the rates are increasing among non-Hispanic white people, nearly 3.5 times the rate in 1999, according to the CDC.
Read TIME’s cover story: Why America Can’t Kick Its Painkiller Problem
Researchers acknowledged that several factors could affect death rate measurement, including but not limited to the fact that drug overdose deaths can involve multiple drugs.
Heroin, however, has been a growing concern in the U.S. The CDC noted in 2015 that heroin use has increased among both men and women across most age ages and income level.
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