I highly recommend something like this to make this a total stealth spot. You could vent it into the HVAC and it will find away to pull in fresh air. Also a must have if you happen to start growing.
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Carbon air filtration is the best. End of story.
Normal air purifiers don't do shit and the people who think they do still reek of weed and can't tell lmao. Only carbon can grab that super sticky organic type of smell.
Do what growers do and buy something like this. Just run that in whatever room you're smoking in and try to exhale into the fan. Even if you don't directly blow into the fan it will still clear the room itself pretty quickly. Zero smell. ZERO.