Vaping ALMOST exclusively since 12/1/11. The other night, my batteries went dead, and I had apparently forgotten to charge the other set, so I bummed a cigarette from my wife. I smoked the whole thing to get the nicotine, but I knew, two drags in, that I wasn't going to want another one. She even offered me another later on, but I turned it down. Went home, put one set of batteries on the charger for an hour (long enough to give me a charge to get me to bedtime), and then put the other set of batteries on the charger, and I was back to normal in the morning.
It will be different for different folks...but cigarettes are now a "last resort" for me, and something I can leave behind easily when I can vape again.