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There would be someone like a head of residence life who you could ask for a new assignment, or you could try going and talking to the little pothead before you try to get him arrested or kicked out of college.
That should have been your first step. I mean we’re like 4 weeks into your semester here, and it sounds like you’ve talked to everyone in your dorm about it except for the kid who’s doing it.
You have his room number. Send him a gift: https://smile.amazon.com/Smoke-Buddy-Assorted-Personal-Filter/dp/B076Q5JWJD/ref=mp_s_a_1_4?crid=2R4RDMG47IZFZ&keywords=smoke+buddy&qid=1664039760&sprefix=smoke+bu%2Caps%2C131&sr=8-4
Smoke Buddy or cardboard tube with dryer sheets.
Every stoner thinks weed smell dissipates, they are high. Smokers can't smell smoke as well. Use a smoke filter.
I guess if you're concerned you could exhale into an old gym sock, and if you're very concerned you could get a Smokebuddy