Just finished making my filter so i can smoke inside with no smell at all, its easy to make, i used a water bottle with one end cut off and taped a bounty dryer sheet over the end to filter the smoke, i cut then cut a whole the size of the bottle in an OJ container on the top, slid the bottle inside of it, cut another whole in the side, just big enough to slide a burning incent in, simply smoke your bowl and put a quarter over the bowl so the cherry doesnt keep burning into your room, light the incent up slide in and blow your hit in to the water bottle to be filtered through the bottle and masked by incent and there you have it. Happy toking!