Another common use for medicinal cannabis is stimulating appetite. In a clinical trial conducted by the National Cancer Institute, "patients with HIV/AIDS and weight loss found that those who took dronabinol (delta-9-THC) had increased appetite and stopped losing weight compared with patients who took a placebo." Though, the trial also found that the dronabinol was less effective at increasing the appetite of patients in the advanced stages of cancer than standard treatment methods [source: National Cancer Institute].
Studies of healthy people performed by the institute indicate that the inhalation of cannabis can lead to an increased consumption of calories, especially in sweet and fatty foods. In addition, many animal studies have proven that inhaling cannabinoids increases food consumption [source: National Cancer Institute].