A cheap, highly addictive drug called "cheese" heroin is wrecking lives in the Dallas, Texas, area. Twenty-one teenagers in the area have died from an overdose during the past two years, and dozens more are in rehab today.

Fernando Cortez Sr. lost his 15-year-old son to "cheese" earlier this year. Here, he and a pair of recovering addicts talk about the up-and-coming drug and how it has negatively affected their lives.