I only use them for anti-animal/bug use. Like packing away clothing of my girls from when they where baby's, my Wedding dress, etc. I put them inside the cardboard boxes, before I put in the bagged clothing. **I know you are not to breathe in the vapors from them. Like if someone has tuberulosis or troubles breathing to begin with, you are not to use them at all, can be fatal! And you never want to put them any where small kids or animals can touch/eat them, or constantly breathe fumes of them. I LOVE the smell of them!, but then again I love the smell of gasoline at the pump too!