That is a whitefly and you want to get rid of it, the larvae and the eggs and quickly. Grab some Dr. Zymes Eliminator or some Spinosad - both are organic and both take care of all stages of whiteflies, aphids, thrips, spider mites... always good to have one or the other on hand as they can be used all the way through to harvest if need be without damaging the buds or the taste of your smoke. Just mix as directed and spray just before lights out... make sure you get the whole of the plant(s) - top & bottom of leaves, stem, branches...
Good luck!