A 2017 study in the Cancer journal found that among 926 cancer patients in Washington state, most were interested in learning about cannabis during treatment. Among those actively using it, most people inhaled it or consumed edibles, including candy, butters, oils and baked goods. Most patients listed their reason as pain, followed by nausea or upset stomach and stress. The study noted that comparing results among patients is difficult because of the limited number of studies on medical marijuana and cancer patients.