This can be a very disturbing phenomenon. I have had it happen in the past when I quit with or without vaping. The brain is amazing and sometimes baffling. I work with all kinds of addictions on a daily basis and this phenomenon is common for every substance. Unfortunately, with cigs quitting involves a lot more chemicals than just nicotine. It is natural for our brains to try to come to terms with the fact it is missing something even if you don't feel you are missing it on a conscious level. If it doesn't stop and remains disturbing for you look into information on how to control your dreams. We can redirect what happens in our dreams. Or you can do some simple self talk when you wake from an analog dream. Whatever reaffirms your desire to stay analog free. Those two things can help tremendously, plus though it might recur months or years later, it is temporary.