The effect of drugs can be harmful to the body. They can damage nerves at are use for thinking. According to the "Nation Institutes of Health"(NIH), is one of the most popular used drugs in America ranking third after tobacco and alcohol. Marijuana (the most common form used in America), is made of the dried leaves and flowers of the sativa plant, and looks like oregano. It is usually smoked in a pipe or in hand-rolled cigarettes. Hashish (hash) is a dried-caked resin from the flowers and leaves of the plant. It is sold in chunks and cubes ....