Hey dude heres a Journal about Cannabis Pests, all i can say buy the lloks of ur plant is that if u had spider mites ur leafs would have tiny little spots all over right in the places where the little buggers feast ... so i guess ure dealing with some other bug ...

Anyway heres the link to the pest journal - http://mojo.calyx.net/~olsen/HEMP/IHA/iha03201.html