Oxycontin was built on the idea of turning a drug (MS Contin) for the terminally ill (too small a market) to a lifelong dependency for as many people as possible, and each taking as many milligrams as possible.

I know several doctors who mourn the addiction issues with Oxycontin because it was so useful for a lot of cases. Give someone some Oxycontin, then you can address the root problems, and then get them off - works very well... Now they won't give it to anybody - those addicted know exactly what to say to sound like the people who really need it.