Drugs were not the cause though she thought they were the solution. She turned her life around only after she realized that she was in a downward spiral. Fix your problem. Fix your life. Then you won't need to take drugs.
Drugs are neither the solution nor the problem.
And do not doubt that people can change. When my wife and I had our first child, we were determined to be politically and environmentally correct. We were going to use cotton diapers and wash them ourselves. Two weeks go by. Doing your own cotton diapers doesn't cut it.