What Is Marijuana? Marijuana, a drug obtained from dried and crumpled parts of the ubiquitous hemp plant Canabis sativa (or Cannabis indica). Smoked by rolling in tobacco paper or placing in a pipe. It is also otherwise consumed worldwide by an estimated 200,000,000 persons for pleasure, an escape from reality, or relaxation. Marijuana is known by a variety of names such as kif (Morocco), dagga (South Africa), and bhang (India). Common in the United States, marijuana is called pot, grass, weed, Mary Jane, bones, etc. The main active principle ....