Hi Pointer,
From viewing the photos, and from my experience, the small white dots on the leaves are 100% spider mites, they're are v tricky to remove, and can be v annoying for growers, as they are extremely small (tiny silk like bugs) and suck the sap from the leaves which will then lead to the leaves dying off. If you dont mind spraying plants, then other forums suggests neem oil (vaseline coating for the plants), peppermint spray, ginger anything potent and spider mites dislike this v much, but this can affect the taste of your grow. As a natural grower I tend to avoid these products and have had much success just spraying the bottoms of the leaves with a pressure sprayer to blast the mites off or going along wiping down the leaves with a clean wet cloth thats washed out regularly with just water, (make sure to wipe down the leaf stems as its v hard to get all areas. Try to get into the branch splits aswell as they try to hide in between for protection. Spider mites do not like cold /damp environments or windy areas so keep this in mind when dealing with them. They thrive in temps around 20 degrees and above and can populate hundreds in a matter of days. Hope this advice help you out, and if your in any need of any more advice, id be happy to help. Keep Growing!