Well for what its worth, I used to own a 1992 Plymouth Sundance, and had the same problem. It wasn't so thick that I couldn't see, but you could see the smoke coming in through the vents, and could smell it too. It also was off and on, like yours. Turned out I had a blown motor for the most part. Getting real bad blow by, pistons were burned up pretty good and the list goes on. Not saying this is your problem, but it was with mine, and I had the smoke too.
Chris
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