medical marijuana patients. >> i do a mixture of thc, cbn and cbd. >> frank had to experiment with many different strains of marijuana to find the right kind to treat his chronic pain and arthritis from an old football injury. >> i'm experiencing extreme pain in my knee and i want to get medicated faster, do a dab. my knee will be sore, swelling on the joint, maybe i'll sit down and smoke flower. >> prescribed painkillers made him sick so he was desperate and willing to try something new. >> in 15, 20 seconds is the pain went away. it was go, exited the body. >> the most common use for medical marijuana is pain. early studies suggest that cannabis binds to receipt tors in the brain and body to reduce inflammation and provide a buffer against pain. yet according to stanford trained dr. margaret getty, there is no one set standard cannabis treatment for pain.