@OmSigDAVID,
There is a cure known as the Chinese cure, when the jar of heroin solution is replaced with water each time it's taken, gradually lessening the dose until it's just water. It's not got a very good track record.
I would treat the report with a pinch of salt. An addict cannot just give up or lose interest. It's not like giving up smoking where the results are purely psychological. Either they get treatment or they go through physical and psychological withdrawal symptoms.
That's not to say people can't do it. There's the old woman in
To Kill A Mockingbird who goes through opiate withdrawal when Scout goes round to read to her, just so she can kick the habit before she dies.