Nah, it kills flees on old hardwood style floors. Then you sweep it up and there won't be flees. You didn't know that? It works wonders to keep bugs out of your house. I promise it works. When you finish your cigarettes or weed, just sweep up the ashes and boom. Free bug repellent. The ashes get into the small cracks (old old house) and kills off all the bugs and stuff that might try to come up from under the house. Especially helpful if you have a dog (he has two) or in the summer time when the sand fleas and chiggers start popping up.