Answer would be ...... a controlled environment. The four walls that you grow in should be fairly tight and not suseptible to outside conditions. If you have a tight grow room, using an extraction fan into a carbon filter would eliminate your worrys completely. Of course, some strains don't smell like cannabis, they smell like mango, or mint, so it depends on the strain you go for as well. Extraction really takes care of two major obstacles you have to deal with in one go.