The number of drug deaths involving heroin has soared four times since 2000 throughout much of the United States, new statistics indicate. Most of the increase in heroin fatalities occurred after 2010, with the highest rate among adults aged 25–44. “From 2000 through 2013, the age-adjusted rate for drug poisoning deaths [in the US] involving heroin nearly quadrupled from 0.7 deaths per 100,000...