Marijuana is a hemp plant that is grown throughout the world, particularly in tropical or forest environments. The substance in marijuana that gives the user a reaction or "high" is THC. The booklet discusses the physical and psychological effects of marijuana, as well as tolerance and dependence. In noting why marijuana is dangerous, the booklet advises that for short-term users of marijuana, difficulties are primarily found in areas of short-term memory and concentration, diminished coordination, distorted perceptions, and poor judgment. These disabilities can be dangerous, even fatal, if the user tries to drive or operate machinery under the drug's influence. Long-term consequences include permanent physical damage (possibly to the lungs, heart, reproductive system, and brain) and severe emotional difficulties. Cocaine is a powerful drug that comes from the leaf of the Coca tree, grown primarily in the South American countries of Colombia, Ecuador, Peru, Bolivia, and Chile. Cocaine can be "snorted" or inhaled through the nose. It can also be injected into a person's veins when mixed with water, bringing on the effects more quickly and intensely. Freebasing or smoking a purified base form of cocaine is another way to consume it. It is the most dangerous and addictive of the methods. The booklet discusses how cocaine is sold, its physical and psychological effects, and tolerance and dependence. Cocaine can be toxic or cause severe physical damage, as well as stimulate delusions, paranoia, and violent behavior. Crack is a more purified form of cocaine. The booklet discusses how crack is sold, its physical and psychological effects, tolerance and dependence, and dangerousness. Its ability to addict a user rapidly makes it especially dangerous. Five additional resources are listed.