Reminds me of a study about Vietnam and how so many soldiers were hooked on hard drugs like Heroin and Morpheme. Given the incredibly high rates of recidivism typically associated with those drugs, it was assumed that the returning GIs would have enormous drug problems.
But then something happened. When they returned the majority of the GIs kicked the drug habits and led normal lives. What happened?
Turns out that environment matters. If you send a "cured" drug user back into the same environment that made him turn to drugs in the first place, he's likely to get sucked back into the lifestyle. Drug use is a symptom, not a cause, which is why drug addiction treatment doesn't work very well--it's only treating the symptoms. This is also why Wall Street Bankers can be fantastically successful despite expensive coke habits at the same time crack is considered the scourge of the ghetto.
Unfortunately, the cause is much much more difficult to treat, and involves breaking the cycle of poverty and ignorance.