Spider mites on outdoor plants ?? Pretty unusual, unless they are in pots and sheltered. Anyway, yeah, you got big trouble. Cut the plants down immediately to prevent further damage. Once the cell walls collapse, the mites will look elsewhere. When you hang the branches to dry watch the mites climb onto your hanging line, looking for new pastures. Most of the mites will leave, so smoking your damaged material will not contain too many bugs. The protein-enhanced smoke will be o.k.