There are ways of doing that but one must understand that carbon filters are the only way of completely eliminating the smell. Almost all the other processes involve using another overpowering smell to mask it such as using scented candles, deodorants, and room fresheners which will ensure that due to a newer, stronger smell, the older smell isn’t noticed. Opening up your doors and windows will also make sure that the room doesn’t smell as much - but then you’d risk letting the smell out in the open. We strongly suggest growers to buy a carbon filter as it will be the best option of eliminating the smell of weed.