There are also biological factors to consider. I have no problem blowing beauties out my right nostril but the left prefers to trickle down my arm. Either I just can't get up sufficient pressure (maybe that blue pill would help?) or there is some congenital defect that feeds back the pressure into my ear. That side sometimes gave me trouble when scuba diving so it very well could be some actual physical problem. I'm not explaining this to my doctor though.