Adolescent Medicine


Marijuana: What Parents Need to Know

What It Is: Marijuana is the most widely used illegal drug in the United States. It is made from the shredded leaves, stems, seeds, and flowers of the hemp (Cannibis sativa) plant. It looks like green, brown, or gray dried parsley.


What It Does:

Marijuana makes it hard to keep track of time and concentrate. Users have difficulty with memory and find it hard to solve problems and learn.

Marijuana raises heart rate and blood pressure. Some people get red eyes or dry mouths or become sleepy or very hungry. The drug can also make some people paranoid (like someone is out to hurt them or is plotting against them). It can also sometimes cause hallucinations.

Marijuana is as tough on the lungs as cigarettes — steady users suffer coughs, wheezing, frequent colds, and respiratory (airway and lung) infections, like bronchitis.


Reviewed by: Mary L. Gavin, MD
Date reviewed: June 2010
Originally reviewed by: Ryan L. Redman, MD