On some occasions, LSD gives rise to an experience of synesthesia, in which a stimulus of one modality is perceived in a different modality. A Special Case Marijuana is a consciousness-altering drug that I'll consider a special case because it doesn't fit neatly into any of the three previous categories. Marijuana can act as a depressant. In greater doses, marijuana acts as if it were a hallucinogen, producing hallucinations and alterations in mood. It was an important crop in the American colonies, grown by George Washington, among other no tables.
More marijuana is grown in the United States than anywhere else in the world.
THC is also the active ingredient in hashish, a similar but more potent drug also made from the cannabis plant. Although marijuana, in large doses, has been found to increase overall levels of some neurotransmitters, it is not known just how it produces this effect. Marijuana is a difficult drug for society to deal with. In the United States, it is illegal to sell, possess, or use marijuana, yet it can be prescribed to reduce nausea associated with chemotherapy treatments for cancer. There is evidence that marijuana tolerance may develop rapidly, but little evidence that it is addictive.