The day I started vaping was the last day that I had a cigarette, I didn't do the back and forth thing...been vaping for almost 4 months. Honestly, each day I have to "get over the hump" because each day I still want a cigarette. The only thing I can say is to remind her that it is a choice to smoke or not smoke, she is the one with the control, not the cigarette. That's what works for me, recognizing that I could smoke but that it is my choice not to.