More than 8,200 Americans died of heroin-related overdoses in 2013, almost four times the number who died in 2002. That's according to the Centers for Disease Control and Prevention, which reports a sharp rise in heroin use and addiction across almost all demographic groups. Experts attribute the upsurge to the drug's wider availability and lower cost and to an increase in prescription painkiller abuse, which is a strong risk factor for heroin addiction. We discuss what's underlying today's heroin epidemic and what can be done to end it.