I think (as someone who hasn't touched a cigarette in two years, and hasn't touched an ecig since February) that the most important part is that you have to tap

I think (as someone who hasn't touched a cigarette in two years, and hasn't touched an ecig since February) that the most important part is that you have to taper down the nicotine content of the ecigs, otherwise you're just replacing one nicotine delivery system with another and not making any progress. The leap between being nicotine and tobacco free and a cigarette is far greater (mentally and physically) than between a nicotine supplement (ecigs) and a cigarette.