Which of the following is NOT a medical use of marijuana?

Marijuana has been studied and used for a variety of medical applications, including the management of pain, reduction of intraocular pressure in glaucoma, and alleviation of nausea and vomiting associated with chemotherapy.

In the context of medical use, its effectiveness in treating pain arises from its analgesic properties, making it beneficial for conditions ranging from chronic pain to specific neuropathic pain disorders. For glaucoma, marijuana can lower intraocular pressure, which is critical in managing a condition that can lead to loss of vision. Additionally, the antiemetic properties of marijuana are well-documented, particularly in providing relief to patients undergoing chemotherapy who are experiencing severe nausea and vomiting.

While insomnia is a common sleep disorder that individuals may use marijuana to try to treat, it is not officially recognized as a medical use endorsed by research or clinical guidelines in the same way the other conditions are. This distinction highlights why the treatment of insomnia does not rise to the level of established medical use compared to the other conditions listed. Therefore, the correct answer is that insomnia is not considered a medical use of marijuana in the same medically recognized context as pain, glaucoma, or nausea from chemotherapy.