According to other people it works. I always use it in combination with a couple of ciggs too. I spray the house or car down and than walk around blowing smoke everywhere. I have never had an unexpected visit after smoking, so it has never turely been tested. I don't smell weed after using the spray alone, but than I am used to the smell being around me most of the time... so it is hard for me to judge. From my best judegment I works amazingly well though.

Sorry, this prob doesn't help much...