All across the nation, states are legalizing or considering legalizing medical marijuana for a variety of different medical uses, including Crohn’s Disease, ALS and HIV, among others. However, a recent study published in the Journal of the American Medical Association has suggested that medical marijuana may not be effective for many of the illnesses that supporters claim it helps.

The study reviewed 79 randomized controlled clinical trials, which included a total of 6,426 participants. Researchers examined the effectiveness of 10 medical conditions that medical marijuana is purported to treat, which are as follows: nausea and vomiting due to chemotherapy, appetite stimulation in HIV/AIDS, chronic pain, spasticity due to multiple sclerosis or paraplegia, depression, anxiety disorder, sleep disorder, psychosis, glaucoma or Tourette syndrome.

For chronic pain, researchers found “moderate-quality evidence” that cannabinoids were beneficial. Trials testing pain resulting from fibromyalgia, multiple sclerosis, rheumatoid arthritis, and HIV-associated sensory neuropathy did not show any results. There was some...