Some strains of cannabis can cause vaginal dryness. Any strains that cause you to experience dry mouth would dry up your mucous membranes causing more dryness and pain. I would avoid any strains that have that effect on you. There are many cannabis based lubricants that will provide lubrication, increase your sexual experience, and help eliminate any pain associated with dryness. Check out the brand Foria and herbabuena; they have some high rated lubricants.