ONA is some pretty powerful stuff man, I've used the Fresh Linen scent and the regular ONA scent in both misters, gel form, and concentrate liquid form. First and foremost, a properly sized and setup carbon scrubber is going to do more for your cannabis smells than anything will. That said, ONA is a great secondary measure and it's very powerful stuff. The mist cans come with a caddy with a timer so they will spray out a mist every X minutes, the gel (quart size) works best by having a light fan blowing over the top of it (it's an essential oil product,) and the concentrate is primarily used to reconstitute the gels. I've heard some people claim ONA has tainted their buds; personally I have sat quart jars with concentrate added RIGHT next to flowering buds and RIGHT inside a huge tent of drying buds and man, never once did I taste ONA in my stuff or smell it after words. That said, worst case and not wanting to take a chance, stick it outside your tent to catch any off smell.