Same story here. Smoker for 20 years, been vaping for 2. Started at 18 mg, went to 12, then 9 (made this myself by mixing equal parts 12 and 6). Currently at 6 mg. Already have large quantities of 3 mg and 0 mg juice purchased. When my supply of one strength runs out, I move on to a lower one.

I always make a point of sticking at each level for at least 2-3 months. This way I can be sure I've grown fully accustomed to one step before taking the next. In my view, reducing the nicotine content too quickly would increase chances of a relapse.