Heavensfield

What is marijuana? Aren't there different kinds?

Marijuana is a green, brown, or gray mixture of dried, shredded leaves, stems, seeds, and flowers of the hemp plant. You may hear marijuana called by street names such as pot, herb, weed, grass, boom, Mary Jane, gangster, or chronic. There are more than 200 slang terms for marijuana.

Sinsemilla (sin-seh-me-yah; it’s a Spanish word), hashish (“hash” for short), and hash oil are stronger forms of marijuana.

All forms of marijuana are mind-altering. In other words, they change how the brain works. They all contain THC (delta-9-tetrahydrocannabinol), the main active chemical in marijuana. They also contain more than 400 other chemicals. Marijuana’s effects on the user depend on it’s strength or potency, which is related to the amount of THC it contains. The THC content of marijuana has been increasing since the 1970s.

How is marijuana used?

Marijuana is usually smoked as a cigarette (called a joint or a nail) or in a pipe or a bong. Recently, it has appeared in cigar wrappers called blunts, when it is often combined with another drug, such as crack cocaine.

How long does marijuana stay in the user's body?

THC in marijuana is rapidly absorbed by fatty tissues in various organs. Generally, traces (metabolites) of THC can be detected by standard urine testing methods several days after a smoking session. However, in chronic heavy users, traces can sometimes be detected for weeks after they have stopped using marijuana.

How can I tell if a person is using? 

If a person is high on marijuana, he or she might

• seem dizzy and have trouble walking;
• seem silly and giggly for no reason;
• have very red, bloodshot eyes; and
• have a hard time remembering things that just happened.

When the early effects fade, over a few hours, the user can become very sleepy.

What are the short-term effects of marijuana use?

The short-term effects of marijuana include:

• problems with memory and learning
• distorted perception (sights, sounds, time, touch)
• trouble with thinking and problemsolving
• loss of motor coordination; and
• increased heart rate.

These effects are even greater when other drugs are mixed with the marijuana; and users do not always know what drugs are given to them.

Does marijuana affect school, sports, or other activities?

It can. Marijuana affects memory, judgment and perception. The drug can make you mess up in school, in sports or clubs, or with your friends. If you’re high on marijuana, you are more likely to make mistakes that could embarrass or even hurt you. If you use marijuana a lot, you could start to lose interest in how you look and how you’re getting along at school or work.

Athletes could find their performance is off; timing, movements, and coordination are all affected by THC. Also, since marijuana can affect judgment and decisionmaking, its use can lead to risky sexual behavior, resulting in exposure to sexually transmitted diseases like HIV, the virus that causes AIDS.

Does marijuana lead to the use of other drugs?

It could. Long-term studies of high school students and their patterns of drug use show that very few young people use other illegal drugs without first trying marijuana. For example, the risk of using cocaine is much greater for those who have tried marijuana than for those who have never tried it. Using marijuana puts children and teens in contact with people who are users and sellers of other drugs. So there is more of a risk that a marijuana user will be exposed to and urged to try more drugs.

To better determine this risk, scientists are examining the possibility that long-term marijuana use may create changes in the brain that make a person more at risk of becoming addicted to other drugs, such as alcohol or cocaine. Further research is needed to predict who will be at greatest risk.

What does marijuana do to the brain?

Some studies show that when people have smoked large amounts of marijuana for years, the drug takes its toll on mental functions. Heavy or daily use of marijuana affects the parts of the brain that control memory, attention, and learning. A working short-term memory is needed to learn and perform tasks that call for more than one or two steps.

Smoking marijuana causes some changes in the brain that are like those caused by cocaine, heroin, and alcohol. Scientists are still learning about the many ways that marijuana can affect the brain.

Reprinted by permission: National Institute on Drug Abuse (NIDA)