Stuffy Nose?!

Just because variable A and variable B are in close proximity, it doesn't mean that A causes B or vice versa. There could be another variable C causing A or B. If you PMO near house plants or pets or a dusty desktop you're unknowingly allergic to, that is the other variable. You also might just be a natural person who has a lot of sinus problems, even as you seeming PMO most of your life. The two trajectories may have nothing to do with each other, even if they are seen together in time - but so does eating - do you question whether certain foods inflame your sinus problems? Or, catching cold with your pants open in a chilly room when you've been on a 5-hour PMO binge and have forgotten to eat a proper meal?