Far more people in the USA use heroin than a decade ago, a study from the federal Substance Abuse and Mental Health Services Administration found, reports USA Today .
From 2002 through 2007, heroin use was relatively stable with fewer than 400,000 users, the study reported. The number ticked up to 455,000 in 2008, then shot up to 582,000 in 2009. In 2013, the latest year available, 681,000 people used heroin in the previous year.