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Encouraging words of advice or suggestions can indeed be useful for those who need them, but will they work?
If they personally feel in need of encouragement, well of course it will help them, specifically in that context. So it would work. What comes after is a different case.
But doesn't everyone have an impatient attitude, they even give up easily and this is natural attitude that everyone has without exception.
As I said, it is just a different case. Speaking about the whole picture, addiction is complex, surely a single method to help an addicted person won't work. Every addiction must be handled with a different case and scenario. Even if some single method to overcome addiction works, with some particular people it will be different.
What I meant, is if at some point in time, they need a word of encouragement it is a good thing, but that should not be the sole reason that will magically solve the problem.