Ideally your exhaust should pass through a carbon filter and exit the house, from the second story if that's an option. Running a filter helps significantly but if vented back into the house you'll may still smell.. green. As in, the general smell of plants and not skunk. Running it out the second story would prevent any one from randomly walking past the exhaust vent and getting blasted in the face with a delicious aroma.

Side note: If you use a solution of Neem Oil to treat for pests, your tent is going to smell awful for a little. If you vent that back into your house, your house will definitely smell weird.. Think of the scent of wild garlic with an after-aroma of peanuts >_<