I've actually "bummed" a cig from my buddy a couplle times in the last year, only to light it, say, "Nuh-uh" and pass it back to him. I didn't do it from craving, but rather to reinforce my choice.
Even though I've only been vaping for a little over a month, I too have lit up an analog in order to reinforce my choice. Each time and there was only 2, I hated it after the first couple of puffs. I realized that I didn't like it as much as vaping, but also that I had chosen the right path to quitting for good.