I found this list of symptoms for broad mites on the net:
Leaves pale. They appear yellow in color.
Leaves darken on the edge. Edges appear brown in color (necrosis). The feeding activity of mites tends to turn leaves yellow with a dark edge.
Leaves have dark speckles on the underside of them. The dark speckles left by Broad Mites will be found predominantly on the underside of the leaves, especially along the veins. These speckles are actually small scars caused by the feeding activity of the mites.
**Leaves are deformed or twisted.
**Leaves curl down on the edge.
Leaves have yellow spots on them.
Leaves have streaks on the underside of them. These streaks may give the entire underside of the leaves a silvery appearance.
Leaves are brittle or cracked.
Plant growth is slow.
The only two symptoms that match I've marked with two asterisks. None of the other symptoms are evident. The plants are growing rapidly, the puckered leaves are not scarred or discolored in any way. I have a lot of plants of many types growing and currently am having another surge of aphids on some plants, but I can't see any aphids on the brugs. I have a lot of very close relatives to African violets growing and that seems to be the other plant most likely to have these mites attack but, so far, they look healthy and normal. A tiny mite makes sense, but other than the leaves puckering, there doesn't seem to be any other signs.
This list of symptoms came from this web site:
http://www.optimara.com/doctor...
Edited to add there is no Marijuana growing here either! Doing web searches is turning up a lot of info suggesting broad mites are stoners LOL! If I had close neighbors, I might be wondering what they had growing in the way of a host plant.
