One thing I learned as a new grower was that the smell will all of a sudden be there, like a just cut weed-filled hay field, filling your house.
I went to the beach for 4 days. no smell when i left. The plants hit one month of age and I come back to a house that smelled like there was some hay stored inside. not a bad smell, just noticeable.
If you dump the smell outside you have to worry about any close neighbors or the mail person.
You will need a filter and some ducting. I got a Phresh filter and no smell at all now.