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Marijuana, a so-called gateway drug, is the most widely used illicit drug in the United States and tends to be the first illegal drug teens use.

Basic Facts About Marijuana
Marijuana is a green or gray mixture of dried, shredded flowers and leaves of the hemp plant Cannabis sativa. There are over 200 slang terms for marijuana.

The Health Effects of Marijuana
Although legalization activists and many marijuana users believe smoking pot has no negative effects, scientific research indicates that marijuana use can cause many health problems.

Marijuana Problem Screening Quiz
Smoking marijuana can cause problems in many areas of your life, sometimes in ways you may not realize. Has it become a problem for you?

Marijuana Withdrawal Symptoms
Symptoms associated with marijuana withdrawal may be milder than withdrawal from alcohol and many other drugs, but they are intense enough to cause people trying to quit to relapse.

Marijuana Withdrawal Symptoms Quiz
Answering these questions will give you an idea if your marijuana withdrawal symptoms are intense enough that they may cause you to relapse if you try to quit.

Medical Marijuana an Easy Target for Abuse
States which have passed medical marijuana laws did so to help patients with serious medical conditions, but many are finding the system is easily abused by those seeking to get high.

How Long Does Marijuana Stay in the Body?
The effects of smoking marijuana fade very quickly, but the drug can be detected in the body for weeks and sometimes longer.

DEA: Smoked Marijuana Is Not Medicine
Because so many states have legalized marijuana for medical use, you may have assumed that its use has been approved for medicinal purposes. That is not the case.

Pictures of Marijuana for Parents

These photos can help you identify marijuana in its various stages of growth and processing for use.

What Not to Say to Someone Who Smokes Marijuana
For those who are committed or long-time marijuana users, there is not much you can say that will change their opinion that smoking weed is perfectly harmless.

Marijuana Photo Gallery
Photos of marijuana growing indoors and after it is processed for distribution.

Marijuana - FAQs for Teens
These questions compiled by the National Institute on Drug Abuse are the most asked by teens concerning marijuana.

Legalizing Marijuana Sends Youth the Wrong Message
Health officials are concerned that the trend toward legalizing marijuana for medical and recreational use sends the wrong message to those who are most vulnerable to its effects.

Marijuana - FAQs for Parents
These questions compiled by the NIDA are the most asked by parents about marijuana.

Marijuana: The Myths Are Killing Us
Karen Tandy, the administrator of the U.S. Drug Enforcement Administration, examines the harm done to the youth of America by myths surrounding marijuana use and its alleged medicinal benefits.

Long-Time Marijuana Use Can Hamper Motivation
Because long-term marijuana use lower production of a brain chemical that is linked to motivation, it could contribute to the notion that some pot smokers are slackers.

Even Casual Marijuana Use Can Cause Changes in the Brain
MRI images show that even casual marijuana use can cause significant changes in brain regions associated with motivation and decision making.

Has Smoking Marijuana Affected Your Health?
Has your doctor told you that a health problem you're experiencing could be due to your marijuana use, past or present?

Smokers Underestimate Marijuana's Harm
Results of a study suggest that people who abstain from smoking marijuana appear to have a better quality of life and higher levels of educational achievement than marijuana users.

Marijuana Use Linked to Risk of Testicular Cancer
marijuana linked testicular cancer young males men frequent smokers adolescent smoking

Heavy Marijuana Use Affects Learning, Social Skills
A vast amount of scientific research has shown that heavy marijuana use negatively effects smokers' learning abilities and social skills, causing problems in their daily lives and compounding their existing problems.

Smoking Marijuana Doubles Risk of Testicular Cancer
Young men who have ever smoked marijuana are twice as likely to develop mixed germ cell tumors compared with those who have never smoked weed.

Long-Term Marijuana Use Affects Memory
Long-term marijuana use causes memory, speed of thinking and other cognitive abilities get worse over time, but cognititive abilities are also affected in short-term pot smokers who use marijuana frequently.

Marijuana, Spice Use Can Affect Embryo's Brain
Smoking marijuana, or using syntehtic forms of weed, can cause damage to the developing embryo's brain.

Smoking Medical Marijuana Can Get You Fired
Even if you live in a state where medical marijuana is legal and you have a prescription, you could be fired by your employer if you fail a drug test.

Teen Brains Damaged by Heavy Marijuana Smoking
A study from the Children's Hospital of Philadelphia using imagining technology has found visible damage in the developing brains of teenagers who are heavy marijuana smokers.

Marijuana Use Linked to Heart Attack, Stroke
A study of heavy marijuana users has found increased amounts of a blood protein typically associated with increased risk of heart attack and stroke.

Smoking Marijuana Doubles Risk of Fatal Accidents
Driving after smoking even a small amount of marijuana almost doubles the risk of a fatal highway accident, according to an extensive study of 10,748 drivers involved in fatal crashes between 2001 and 2003.

Heavy Marijuana Use Linked to Gum Disease
It is well documented that tobacco smoke contributes to gum disease, but now a new study has found a link between heavy marijuana use and periodontal disease.

Popular Slang Terms for Marijuana
Many slang terms for marijuana are derived from the source of the drug, the effect it has on users or the appearance of the processed plant.

U.S. Marijuana Becoming More Potent
The marijuana currently being smoked in the United States is more than double in potency of the drug in the 1980s, posing potential mental health consequences for teens who use the drug to self-medicate episodes of depression.

The membranes of certain nerve cells contain protein receptors that bind THC. Once securely in place, THC kicks off a series of cellular reactions that ultimately lead to the high that users experience when they smoke marijuana.

Marijuana - Quick Facts
Drug Profile: Commercial and street names, method of use, intoxication effects and potential health consequences for marijuana.

Hashish - Quick Facts
Drug Profile: Commercial and street names, method of use, intoxication effects and potential health consequences for hashish.

Marijuana Withdrawal as Tough as Cigarettes
For heavy marijuana smokers -- those who smoke 25 days or more per month -- withdrawal symptoms when they try to quit smoking can be similar to those experienced by people who quit smoking cigarettes.

Wife Influences Husband's Marijuana Use
While it's the husband among newlywed couples who has more influence on whether the couple engages in heavy drinking, it's the wife who appears to be in the driver's seat when it comes to determining her husband's marijuana use.

Marijuana Causes Many Deaths Reported as 'Accidents'
Marijuana use is much more dangerous that believed and hundreds of young people die each year in "accidents" caused by their prolonged use of the drug, according to Britain's most senior coroner.

Teens in Treatment Report Marijuana Withdrawal Symptoms
A new study shows that teens that use marijuana frequently also may face the same withdrawal symptoms that have been found to challenge adult marijuana users trying to quit.

Marijuana May Impair Male Fertility
Men who smoke marijuana frequently have significantly less seminal fluid, a lower total sperm count and their sperm behave abnormally, all of which may affect fertility adversely.

Marijuana Use Affects Blood Flow in Brain
People who smoked marijuana had changes in the blood flow in their brains even after a month of not smoking, which could explain in part the problems with thinking or remembering found in other studies of marijuana users.

Marijuana Use Leads to Later Drug Abuse
A team of researchers from the United States and Australia has found that the age when a person begins to smoke marijuana has a significant influence on whether they will develop problems with drugs and alcohol later in life.

Marijuana Abuse Treatment Increases Sharply
Admission rates for treatment for marijuana as a primary substance of abuse increased 162 percent nationally between 1992 and 2002, according to a trend report from the Substance Abuse and Mental Health Services Administration.

Marijuana Interferes With Attention
Sustained attention to timing-tasks was substantially altered in laboratory rats when they were given a synthetic cannabinoid - a compound similar to the naturally occurring one in marijuana.

Marijuana Triggers Schizophrenia-Like Symptoms
The principal active ingredient in marijuana causes transient schizophrenia-like symptoms ranging from suspiciousness and delusions to impairments in memory and attention, according to a Yale research study.

Early Marijuana Use Linked to Cognitive Impairment
There is evidence that individuals who start to smoke marijuana at an early age — while the brain is still developing — show deficits in cognition which are not seen in individuals who begin use of the drug when they are older.

Marijuana Use Linked to Hallucinogen Use
A new study provides the first epidemiological evidence that young marijuana smokers are substantially more likely than non-smokers to be presented with the opportunity to try hallucinogens.

Adult Marijuana Abuse Increased in the 1990s
Researchers at the National Institutes of Health compared marijuana use in the U.S. adult population in 1991-92 and 2001-02 and found the prevalence of marijuana abuse or dependence had increased markedly.

National Drug Education Program Launched
To raise awareness about the effects of drug use on the most vulnerable populations - children and adolescents - Community Anti-Drug Coalitions of America is partnering with the National Institute on Drug Abuse to release a new drug abuse education effort.

Researchers Find Clues to Marijuana Effects
Marijuana has been reported effective in the treatment of multiple sclerosis, glaucoma, nausea caused by chemotherapy and wasting caused by AIDS. However, like all drugs, it also causes numerous unwanted side effects, including hypothermia, sedation, memory impairment, motor impairment and anxiety.

Cigarettes, Marijuana Linked for Teens
Teens who smoke cigarettes are 14 times likelier than their counterparts who have never smoked to try marijuana, six times likelier to be able to buy marijuana in an hour or less and 18 times likelier to say most of their friends smoke marijuana.

Pot Doesn't Cause Permanent Brain Damage
An analysis of research studies with long-term, recreational users of marijuana has failed to reveal a substantial, systematic effect on the neurocognitive functioning of users.

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