To know the truth as to the range of ailments cannabis can effectively treat, we must rely on existing works of research. The National Academies of Science, Engineering, and Medicine after reviewing over 10,000 studies on medical marijuana finally agreed on some ailments that cannabis is useful for. The range of ailments they agreed upon include pain, spasms, insomnia, and nausea associated with chemotherapy. These remain the well-researched medicinal benefits of cannabis and many of the uses of medical marijuana fall under this category.