Montana is one of the more than twenty US statesThe state of Montana is one of the more than twenty US states that have legalized medical marijuana. It was approved in 2004 and has helped a lot of people since then.   People suffering from the following diseases can apply to be part of the medical marijuana program in Montana: multiple sclerosis, AIDS/HIV, glaucoma, seizures, severe nausea, chronic pain, cachexia, persistent muscle spasms, seizures, Crohn's disease, and ...