Got my 510 on a Monday. Smoked 2 analogs that day, 2 analogs the next, then 1 each day for the next couple of days. Each one tasted a little worse than the last. After that, I quit analogs altogether. So, I overlapped for a few days, then quit altogether. For me, that initial period was basically learning to trust the 510 to deliver the nicotine that I was craving. Once I got past that, no more analogs.