"If you look at just the raw statistics," he says, "over the last four or five years, heroin deaths went up 45 percent." Experts say the problem can be traced back to the aggressive prescribing of opioid drugs for pain about 15 years ago. OxyContin and Percocet are two popular, legal opioid drugs. Heroin is also an opioid drug; it's the illegal cousin. They are all made from the poppy plant, and they are all addictive.