Try using a sinus rinse or a netti-pot
It might help. I occasionally get stuffed up after smoking (I blow the smoke through my nose) and the sinus rinses help me. Just follow the directions carefully.
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"One fart can foul the air for everyone" - Esteemed philosopher
"If avoiding the nasty $hit is being a snob, them I am guilty as charged."- Same esteemed philosopher.