Pest strips are awsome and do really work. However, I don't think I would use them within a week before harvest, or even at all if some good buds have started to show up. The active chemical is extremely toxic, and can make you have 4 elbows growing out of your buttocks. I don't think I would want to take a chance on smoking it, but who knows, maybe it will give you super powers or something.

You do have reason for concern. I would not let someone into my grow room if they are wearing the same clothes and did not shower since they last visited their grow room that has tendencies of mite problems. All it takes is one male and one female to screw up your life good.

However, if you have not seen any signs of mites, then you have know reason to worry, and you should get that pest strip out of there immediatly if not sooner.