The Centers for Disease Control and Prevention have released an analysis of annual heroin deaths in the New England Journal of Medicine. Drug overdose deaths have risen over the past two years, with deaths due to heroin alone jumping by 39%. This marks the third year in a row that heroin deaths have increased. About half of overdose deaths last year were due to prescription drugs, though prescription drug use remained stable from 2011 to 2013. The Journal of the American Medical Association explains that the average heroin addict begins using at the age of 23 after starting on painkillers prescribed by a doctor.

Click here to read the full article by Nadia Kounang for CNN.