How Difficult Is It to Quit Drug and Cure Drug Addiction Problem?

Published February 24, 2010

My brother had drug problem for at least 10+ years. He used the heavy stuff like cocaine and other stuff I don’t even know of.
The doctor gave him medication to clean his system, and he has been sober for 2 years.
Is it possible for somebody to cure their heavy drug addiction problem in short 2 years? What’s the odd that my brother’s problem is cured?