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Heroin overdose deaths more than tripled betweeen 2010-2015, with those in the age group 25–34 years being the hardest hit.
 
The number of drug overdose deaths involving heroin increased from 2,088 in 2006 to 12,989 in 2015. The CDC reports that "The rate of drug overdose deaths involving heroin increased slightly during 2006–2010 but more than tripled during 2010–2015 for all age groups shown...In 2015, the rate of drug overdose deaths involving heroin was highest for persons aged 25–34." The rate of drug overdose deaths involving heroin for persons aged 25-34 increased from 1.6 per 100,000 in 2010 to 7.4 per 100,000 in 2015.
 
For a chart of these statistics from the Morbidity and Mortality Weekly Report (MMWR), see: