The white spots can be a number of things, and the pain in the ass for growers is trying to figure out which problem it is, and then trying to fix it. It can be spider mites, which dwell mostly underneath the leaf unless they are munching on the leaf. When they munch you can see them on the surface, and they leave these white spots where they bit. But it's more like white discoloration from them sucking the life out of it. These are a bitch, as you can almost never exterminate them. YOu can only try to maintain their population. Another option is powder mildew or mold. This stuff looks like tiny tiny salt crystals dusted all over the leaves. They are a bit easier to handle, and some organic fungicide should get rid of them if you repeat the treatment as directed. They COULD be whitefly honeydew drops and larva. But this is unlikely unless you've seen white gnats fly about. Of course there's always the possbility that the white spots are early THC trichome development. In my opinion its always hard to tell if its THC because some strains don't exhibit THC for a while, and some strains do, depending on your grow conditions. I've heard people rubbing the crystals on the fingers and smelling it to see if it's THC. Best option for you is to 1. get a camera and post a pic of your plants on this site, and 2. buy some neem-oil based fungicide WITH insecticide. Its like 20 bucks and will come in handy, if not now, then in the future.