Weed is a slang term for marijuana. The substance is made from dried and crushed flowers and leaves of the Cannabis sativa plant. The active ingredient in weed is THC (tetrahydrocannabinol), which is a psychoactive chemical that leaves the user feeling euphoric.
Weed or Marijuana, whatever you call it, is a drug that's illegal in most parts of the world. But there is a huge demand for Marijuana, and its sale boosts the economy of many countries. There are evidences of Marijuana being used as early as 1000 B.C. and there is also mention of it in the Bible. The herb was said to have been used as a medicinal remedy in several parts of the world, including the East and West Africa, India, Asia and the Middle East.
Weed is a slang term (also known as weed, grass, pot, dope, and Mary Jane). TO SMOKE WEED IS TO INHALE THE COLLECTIVE RESIN EXTRACTED FROM THE MARIJUANA PLANT.