The goal of this study is to perform a double-blind, placebo-controlled study to investigate the efficacy of cannabis, compared to placebo, in medically ill participants seeking relief symptoms such as pain, nausea, and vomiting. Participants who meet criteria for severe conditions will be referred from their clinicians . Cannabis that has a high concentration of cannabidiol, which is a cannabinoid that does not change perception or produce intoxication, and low in Δ-9-THC will be used. In this way, the hope is to maximize the benefit of cannabis, while lowering the possible side effects of cannabis in medically ill participants.