What tends to make people change is losing something big. Whether it be a friend, animal, or spouse/kids. It doesn't matter what's going on, you don't realize how bad it's gotten until you start to see the effects of the struggle your going through. The moment will hit them, when everyone is least expecting it. The change will take a while, and it might not happen fast, but it will eventually happen . There will always be flashbacks and problems, but the strong survive and the weak find excuses.