The use of marijuana for medical use – or rather, cannabis for medical use – has now been approved in many countries, although the debate continues to remain heated, arousing conflicting opinions. In truth, the use of cannabis in the medical field goes back much further than one might imagine. Suffice it to say that the first documentation mentioning marijuana for medicinal use is in Chinese medical texts dating back 3,000 years. However, some of the therapeutic properties traditionally ascribed to marijuana by folk medicine have been amply confirmed by numerous studies and clinical trials, so much so that its use in therapy has been approved. Marijuana for medical use (or medical cannabis, as it is known) is used in various cases such as inducing analgesia, treating chronic pain, alleviating nausea and vomiting induced by chemotherapy, stimulating appetite, countering involuntary movements in Tourette syndrome patients, and reducing intraocular pressure in glaucoma patients.