I don't know why, but out of the blue I am having a really strange craving for a cig right now. Strange, I don't like even being around smoke anymore and I'm not stressed or anything. 

I see no reason for not having an occasional cigarette when you get a strong craving. It doesn't mean you failed at quitting assuming you go back to vaping. Upping your nic level at these times may help. I've been lucky. I still have a couple cigarettes around just in case but after 1 1/2 yrs I've never had a craving for a real cig.