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The Effects
of Marijuana on Humans
Short-term effects of using marijuana include:
-
Sleepiness
-
Difficulty
keeping track of time, impaired or reduced short-term
memory
-
Reduced
ability to perform tasks requiring concentration and
coordination, such as driving a car
-
Increased
heart rate
-
Potential
cardiac dangers for those with preexisting heart
disease
-
Bloodshot
eyes
-
Dry
mouth and throat
-
Decreased
social inhibitions
-
Paranoia,
hallucinations
-
Impaired
or reduced short-term memory
-
Impaired
or reduced comprehension
-
Altered
motivation and cognition, making the acquisition of
new information difficult
-
Paranoia
-
Psychological
dependence
-
Impairments
in learning, memory, perception, and judgment -
difficulty speaking, listening effectively, thinking,
retaining knowledge, problem solving, and forming
concepts
-
Intense
anxiety or panic attacks
Long-term
effects of using marijuana include:
-
Enhanced
cancer risk
-
Decrease
in testosterone levels and lower sperm counts for men
-
Increase
in testosterone levels for women and increased risk of
infertility
-
Diminished
or extinguished sexual pleasure
-
Psychological
dependence requiring more of the drug to get the same
effect
What
is THC?
THC
is the chemical in marijuana which makes you feel
"high" (which means experiencing a change in mood
and seeing or feeling things differently). Certain parts of
the plant contain higher levels of THC. The flowers or buds
have more THC than the stems or leaves.
The
Effect of THC
When
marijuana is smoked, THC goes:
THC
is absorbed more slowly into the blood when marijuana is
eaten as it has to pass through the stomach and intestine
and can take up to one hour to experience the
"high" effects which can last up to 12 hours.
THC
is absorbed quickly into body fat and is then released very
slowly back into the blood. This process can take up to one
month for a single dose of THC to fully leave the body.
Effects
of Marijuana
The
effects of marijuana will vary from person to person
depending on:
-
How
much taken
-
How
strong (potent) the marijuana is
-
How
the marijuana is taken (joint, bong, food)
-
Size,
weight, health
-
Mood
-
Individual
experience with marijuana
-
If
marijuana is taken with other drugs
-
Whether
alone or with other people, at home or at a party.
| Onset |
0-10
minutes |
|
Coming
Up
|
5-10
minutes |
| Plateau |
15-30
minutes |
| Coming
Down |
45-60
minutes |
| After
Effects |
30-60
minutes |
|
Because
marijuana users often inhale the unfiltered smoke
deeply and then hold it in their lungs as long as
possible, marijuana is damaging to the lungs and
pulmonary system. Marijuana smoke contains some of
the same carcinogens and toxic particulates as
tobacco, sometimes in higher concentrations.
Long-term users of cannabis may develop
psychological dependence and require more of the
drug to get the same effect. The drug can become
the center of their lives.
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The
Effects of Marijuana on the Male:
Marijuana
is the most common drug used by adolescents in America
today. Marijuana affect the parts of the brain which
controls the sex and growth hormones. In males, marijuana
can decrease the testosterone level. Occasional cases of
enlarged breasts in male marijuana users are triggered by
the chemical impact on the hormone system. Regular marijuana
use can also lead to a decrease in sperm count, as well as
increases in abnormal and immature sperm. Marijuana is a
contributing factor in the rising problem of infertility in
males. Young males should know the effects and potential
effects of marijuana use on sex and growing process before
they decide to smoke marijuana.
The
Effects of Marijuana on the Female:
Just
as in Males, marijuana effects the female in the part of the
brain that controls the hormones, which determines the
sequence in the menstrual cycle. Its been said that females
who smoked or used marijuana on a regular basis had
irregular menstrual cycles, the female hormones were
depressed, and the testosterone level was raised. Even
though this effect may be reversible, it may take several
months of no marijuana use before the menstrual cycles
become normal again.
Mothers
who smoke marijuana on a regular basis have been reported of
having babies with a weak central nervous system. These
babies show abnormal reactions to light and sound, exhibit
tremors and startles, and have the high-pitched cry
associated with drug withdrawal. Occurring at five times the
rate of Fetal Alcohol Syndrome, Fetal Marijuana Syndrome is
a growing concern of many doctors. Furthermore, doctors
worry that children born to "pot-head" mothers
will have learning disabilities, attention deficits and
hormonal irregularities as they grow older, even if there
are no apparent signs of damage at birth. Pregnant or
nursing mothers who smoke marijuana should talk to their
doctors immediately.
Effects
of Marijuana on the Brain:
Researchers
have found that THC changes the way in which sensory
information gets into and is acted on by the hippocampus.
This is a component of the brain's limbic system that is
crucial for learning, memory, and the integration of sensory
experiences with emotions and motivations. Investigations
have shown that neurons in the information processing system
of the hippocampus and the activity of the nerve fibers are
suppressed by THC. In addition, researchers have discovered
that learned behaviors, which depend on the hippocampus,
also deteriorate.
Recent
research findings also indicate that long-term use of
marijuana produces changes in the brain similar to those
seen after long-term use of other major drugs of abuse.
Effects
of marijuana on the Lungs:
Someone
who smokes marijuana regularly may have many of the same
respiratory problems that tobacco smokers have. These
individuals may have daily cough and phlegm, symptoms of
chronic bronchitis, and more frequent chest colds.
Continuing to smoke marijuana can lead to abnormal
functioning of lung tissue injured or destroyed by marijuana
smoke.
Regardless
of the THC content, the amount of tar inhaled by marijuana
smokers and the level of carbon monoxide absorbed are three
to five times greater than among tobacco smokers. This may
be due to the marijuana users inhaling more deeply and
holding the smoke in the lungs.
Effects
of Marijuana on Heart Rate and Blood Pressure:
Recent
findings indicate that smoking marijuana while shooting up
cocaine has the potential to cause severe increases in heart
rate and blood pressure. In one study, experienced marijuana
and cocaine users were given marijuana alone, cocaine alone,
and then a combination of both. Each drug alone produced
cardiovascular effects; when they were combined, the effects
were greater and lasted longer. The heart rate of the
subjects in the study increased 29 beats per minute with
marijuana alone and 32 beats per minute with cocaine alone.
When the drugs were given together, the heart rate increased
by 49 beats per minute, and the increased rate persisted for
a longer time. The drugs were given with the subjects
sitting quietly. In normal circumstances, an individual may
smoke marijuana and inject cocaine and then do something
physically stressful that may significantly increase risks
of overload on the cardiovascular system.
Effects
of Heavy Marijuana Use on Learning and Social Behavior:
A
study of college students has shown that critical skills
related to attention, memory, and learning are impaired
among people who use marijuana heavily, even after
discontinuing its use for at least 24 hours. Researchers
compared 65 "heavy users," who had smoked
marijuana a median of 29 of the past 30 days, and 64
"light users," who had smoked a median of 1 of the
past 30 days. After a closely monitored 19- to 24-hour
period of abstinence from marijuana and other illicit drugs
and alcohol, the undergraduates were given several standard
tests measuring aspects of attention, memory, and learning.
Compared to the light users, heavy marijuana users made more
errors and had more difficulty sustaining attention,
shifting attention to meet the demands of changes in the
environment, and in registering, processing, and using
information. The findings suggest that the greater
impairment among heavy users is likely due to an alteration
of brain activity produced by marijuana.
Longitudinal
research on marijuana use among young people below college
age indicates those who used have lower achievement than the
non-users, more acceptance of deviant behavior, more
delinquent behavior and aggression, greater rebelliousness,
poorer relationships with parents, and more associations
with delinquent and drug-using friends.
Effects
of Marijuana on Pregnancy:
Any
drug of abuse can affect a mother's health during pregnancy,
and this is a time when she should take special care of
herself. Drugs of abuse may interfere with proper nutrition
and rest, which can affect good functioning of the immune
system. Some studies have found that babies born to mothers
who used marijuana during pregnancy were smaller than those
born to mothers who did not use the drug. In general,
smaller babies are more likely to develop health problems.
A
nursing mother who uses marijuana passes some of the THC to
the baby in her breast milk. Research indicates that the use
of marijuana by a mother during the first month of
breast-feeding can impair the infant's motor development
(control of muscle movement). Research also shows more anger
and more regressive behavior (thumb sucking, temper
tantrums) in toddlers whose parents use marijuana than among
the toddlers of non-using parents.
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