Final answer:
Marijuana, containing THC, has psychoactive effects and is used medicinally in some U.S. states though it remains federally illegal. The FDA approves certain THC and CBD medications for specific conditions.
Step-by-step explanation:
The dried leaves, stems, and seeds from the cannabis plant, known for their hallucinogenic effects, contain THC (tetrahydrocannabinol), which is responsible for altering mood and consciousness. Marijuana is a green, brown, or gray mix of dried parts from the marijuana plant with psychoactive properties that can lead to both short-term and long-term effects on the brain. While the legality of marijuana use is complex and varies across the United States, it has been approved for medical use in several states under certain conditions. The FDA has approved drugs containing THC for the treatment of nausea due to chemotherapy and for appetite enhancement in AIDS patients, as well as a CBD-based drug for severe childhood epilepsy.