Yes KC I know what you mean and can safely say (for me at least) it does clear!
I can't say exactly when but somewhere between 25 and 35 days I stopped and thought 'where has that head-mush gone?', now I am on day 45 and I'm quicker at thinking and have a longer attention span, it's still not the best attention span - I doubt it never will be!
It will go, and I'm sure it is a common symptom, stick with the quitting you have done so well and look forward to a fog-free you ;-)