Fact: Research shows
that nearly 50 percent of teenagers try marijuana before they graduate
from high school.
In 2000, over 3 million youths aged 12 to 17 used
marijuana at least once during the past year.
White youths were more likely to use marijuana than
Hispanic, black, or Asian youths.
Youths with an average grade of D or below were more
than 4 times as likely to have used marijuana in the past year as
youths who reported an average grade of A.
57 percent of youths aged 12 to 17 agreed that obtaining
marijuana would be easy.
Nearly 25 percent of youths agreed that a lot of
drug selling occurs in their neighborhoods.
One in six youth had been approached by someone selling
drugs in the month before the survey.
More than 25 percent of youths who had been
approached by someone selling drugs in the month before the survey
had used marijuana in the past month.
In the 1970s, the baby boom generation was coming
of age, and its drug of choice was marijuana. By 1979, more than
60 percent of 12th-graders had tried marijuana at least once in
their lives. From this peak, the percentage of 12th-graders who
had ever used marijuana decreased for more than a decade, dropping
to a low of 33 percent in 1992. However, in 1993, first-time marijuana
use by 12th-graders was on the upswing, reaching 50 percent by 1997.
Although the percentage of 12th-graders who have experience with
marijuana has remained roughly level since then, there is still
reason to be concerned. In 1999, more than 2 million Americans used
marijuana for the first time. Two-thirds of them were between the
ages of 12 and 17. Furthermore, the marijuana that is available
today can be 5 times more potent than the marijuana of the 1970s.
The use of marijuana can produce adverse physical,
mental, emotional, and behavioral changes, and - contrary to popular
belief - it can be addictive. Marijuana smoke, like cigarette smoke,
can harm the lungs. The use of marijuana can impair short-term memory
, verbal skills , and judgment and distort perception. It also may
weaken the immune system and possibly increase a user's likelihood
of developing cancer. Finally, the increasing use of marijuana by
very young teens may have a profoundly negative effect upon their
We hope that this research report will help
make readers aware of our current knowledge of marijuana abuse and
its harmful effects.
Glen R. Hanson, Ph.D., D.D.S.
National Institute on Drug Abuse
Children who become more heavily involved
with marijuana can become dependent, and that is their prime
reason for using the drug. Others mention psychological coping
as a reason for their use - to deal with anxiety, anger, depression,
boredom, and so forth. But marijuana use is not an effective
method for coping with life's problems, and staying high can
be a way of simply not dealing with the problems and challenges
of growing up.
Researchers have found that children and teens (both male and
female) who are physically and sexually abused are at greater
risk than other young people of using marijuana and other drugs
and of beginning drug use at an early age.
Q: What happens after a person smokes marijuana?
a few minutes of inhaling marijuana smoke, the user will likely
feel, along with intoxication, a dry mouth, rapid heartbeat, some
loss of coordination and poor sense of balance, and slower reaction
time. Blood vessels in the eye expand, so the user's eyes look red.
For some people, marijuana raises blood pressure slightly and can
double the normal heart rate. This effect can be greater when other
drugs are mixed with marijuana; but users do not always know when
that happens. As the immediate effects fade, usually after 2 to 3 hours,
the user may become sleepy.
Q: How long does marijuana
stay in the user's body?
A: THC in marijuana is readily 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 heavy, chronic users,
traces can sometimes be detected for weeks after they have stopped
Q: Can a user have a bad
A: Yes. Some users, especially someone
new to the drug or in a strange setting, may suffer acute anxiety
and have paranoid thoughts. This is more likely to happen with high
doses of THC. These scary feelings will fade as the drug's effects
wear off. In rare cases, a user who has taken a very high dose of the drug
can have severe psychotic symptoms and need emergency medical treatment.
Other kinds of bad reactions can occur when marijuana is mixed with
other drugs, such as PCP or cocaine.
Q: How is marijuana harmful?
A: Marijuana can be harmful in a number
of ways, through both immediate effects and damage to health over
time. Marijuana hinders the user's short-term memory (memory for recent
events), and he or she may have trouble handling complex tasks.
With the use of more potent varieties of marijuana, even simple
tasks can be difficult.
Because of the drug's effects on perceptions and reaction time,
users could be involved in auto crashes. Drug users also may become
involved in risky sexual behavior. There is a strong link between
drug use and unsafe sex and the spread of HIV, the virus that causes
AIDS. Under the influence of marijuana, students may find it hard
to study and learn. Young athletes could find their performance
is off; timing, movements, and coordination are all affected by
Q: How does marijuana affect driving?
A: Marijuana affects many skills required
for safe driving: alertness, the ability to concentrate, coordination,
and reaction time. These effects can last up to 24 hours after smoking
marijuana. Marijuana use can make it difficult to judge distances
and react to signals and sounds on the road.
There are data showing that marijuana can play a role in crashes.
When users combine marijuana with alcohol, as they often do, the
hazards of driving can be more severe than with either drug alone.
A study of patients in a shock-trauma unit who had been in traffic
accidents revealed that 15 percent of those who had been driving
a car or motorcycle had been smoking marijuana, and another 17 percent
had both THC and alcohol in their blood.
In one study conducted in Memphis, TN, researchers found that, of
150 reckless drivers who were tested for drugs at the arrest scene,
33 percent tested positive for marijuana, and 12 percent tested
positive for both marijuana and cocaine. Data also show that while
smoking marijuana, people show the same lack of coordination on
standard "drunk driver" tests as do people who have had
too much to drink.
Q: Do marijuana users lose their motivation?
A: Some frequent, long-term marijuana
users show signs of a lack of motivation (amotivational syndrome).
Their problems include not caring about what happens in their lives,
no desire to work regularly, fatigue, and a lack of concern about
how they look. As a result of these symptoms, some users tend to
perform poorly in school or at work. Scientists are still studying
Q: Can a person become addicted to
A: Yes. While not everyone who uses
marijuana becomes addicted, when a user begins to seek out and take
the drug compulsively, that person is said to be dependent on the
drug or addicted to it. In 1995, 165,000 people entering drug treatment
programs reported marijuana as their primary drug of abuse, showing
they needed help to stop using. Some heavy users of marijuana show signs
of dependence because when
they do not use the drug, they develop withdrawal symptoms. Some
subjects in an experiment on marijuana withdrawal had symptoms,
such as restlessness, loss of appetite, trouble with sleeping, weight
loss, and shaky hands.
According to one study, marijuana use by teenagers who have prior
serious antisocial problems can quickly lead to dependence on the
drug. That study also found that, for troubled teenagers using tobacco,
alcohol, and marijuana, progression from their first use of marijuana
to regular use was about as rapid as their progression to regular
tobacco use, and more rapid than the progression to regular use
Q: What is "tolerance"
A: "Tolerance" means that
the user needs increasingly larger doses of the drug to get the
same desired results that he or she previously got from smaller
amounts. Some frequent, heavy users of marijuana may develop tolerance
Q: Are there treatments to
help marijuana users?
A: Up until a few years ago, it was
hard to find treatment programs specifically for marijuana users.
Treatments for marijuana dependence were much the same as therapies
for other drug abuse problems. These include detoxification, behavioral
therapies, and regular attendance at meetings of support groups,
such as Narcotics Anonymous.
Recently, researchers have been testing different ways to attract
marijuana users to treatment and help them abstain from drug use.
There are currently no medications for treating marijuana dependence.
Treatment programs focus on counseling and group support systems.
From these studies, drug treatment professionals are learning what
characteristics of users are predictors of success in treatment
and which approaches to treatment can be most helpful.
Further progress in treatment to help marijuana users includes a
number of programs set up to help adolescents in particular. Some
of these programs are in university research centers, where most
of the young clients report marijuana as their drug of choice. Others
are in independent adolescent treatment facilities. Family physicians
are also a good source for information and help in dealing with
adolescents' marijuana problems.
Drug Abuse Teen
Marijuana, Other Drug Use Among Teens
Continues to Rise
By Neil Swan, NIDA NOTES Contributing
The percentage of America's 8th, 10th, and 12th graders who use
marijuana continued to increase last year, according to NIDA's 1994
Monitoring the Future study. Students' use of several other categories
of drugs also escalated, while anti-drug attitudes among teenagers
deteriorated, the survey found. For the third year in a row, the
survey reported a statistically significant increase in annual marijuana
use by 8th-grade students. Thirteen percent of 8th graders said
they had tried marijuana at least once in the past year-up from
9.2 percent in 1993, 7.2 percent in 1992, and 6.2 percent in 1991.
It was the second year in a row that annual marijuana use among
10th- and 12th-grade students increased. Tenth graders' annual marijuana
use jumped from 19.2 percent in 1993 to 25.2 percent. According
to the annual survey, 30.7 percent of high school seniors said they
had tried marijuana at least once in the past year, compared with
26 percent of seniors in 1993 and 21.9 percent of seniors in 1992.
Trends in Adolescents' Annual Use of Marijuana
Annual marijuana use increased for the second year in a row
among 10th and 12th graders and for the third year in a row
among 8th graders.
Options for parents may also include placement in specialty
schools for defiant teens, boot camps, residential treatment
centers, and military type schools. Call toll free 800 503 0338
and we will help you find your way through the myriad of options
available to you.