Maybe consider something like this? I grow a certain plant that has a strong smell. This 100% removes it. It also removes other smells. Makes my basement have zero odor. It can be loud, but it sure works. Just make sure you get a speed regulator too.
You're not understanding it I don't think, the plants smell way more when growing than when smoking because it's literally contant, putting a fan in a sealed room (aka the smell can't get out) is just circulating the air in that room, which will quickly get wet and dank and you will have mold on everything. If you can't give your room access to fresh air due to smell issues, you prettymuch have to get a carbon filter and inline fan, not just a fan. https://www.amazon.ca/iPower-Inline-Carbon-Filter-ventilation/dp/B00DMG5RRA?pd_rd_wg=EkAQ4&pd_rd_r=f6446be9-c50d-4067-af20-7840b1001bb4&pd_rd_w=fyKJs&ref_=pd_gw_simh&pf_rd_r=KEFNW5AFCR84FK8E9AEN&pf_rd_p=f52db510-19a3-5a54-add4-... Something like that but with the CFM matched to suit your room.
and get at least a 2x3 or 2x4 tent. Just search around there is a lot of brands at varying prices.
We used to flip on a 1200 CFM centrifugal blower we found in a dumpster. I think it was from a range hood or an HVAC system. Just needed a new sleeve bearing and some grease. I put an activated charcoal cylinder from the hydroponics store on the inlet, and placed it in a sound box I built for it. Filter worked so good I didn't even have to exhaust it out the window.
If you don't want to build something, you could get something like this.
Computer fans are poorly designed for static pressure. You could probably get away with a booster fan for a tent that size.
If odor is a concern, and you need a carbon filter, you can still get a proper setup for under $100