1. MARIJUANA: GET THE FACTS

2. What Is It? Marijuana is a mixture of the dried and shredded leaves, stems, seeds, and flowers of the cannabis sativa plant. The mixture can be green, brown, or gray. A bunch of leaves seem harmless, right? But think again. Marijuana has a chemical in it called delta-9-tetrahydrocannabinol, better known as THC.

3. What is THC – A lot of other chemicals are found in marijuana, too—about 400 of them, many of which could affect your health. – THC is the main psychoactive (i.e., mind altering) ingredient. In fact, marijuana’s strength or potency is related to the amount of THC it contains. – The THC content of marijuana has been increasing since the 1970s. For the year 2007, estimates from confiscated marijuana indicated that it contains almost 10 percent THC, on average.

4. How Many Teens Use Marijuana? Some people mistakenly believe that “everybody’s doing it” and use that as an excuse to start using marijuana themselves. Well, they need to check the facts, because that’s just not true. According to NIDA’s 2010 Monitoring the Future study, about 8 percent of 8th graders, 17 percent of 10th graders, and 21 percent of 12th graders had used marijuana in the month before the survey. In fact, marijuana use declined from the late 1990s through 2007, with a decrease in past-year use of more than 20 percent in all three grades combined from 2000 to 2007. Unfortunately, this trend appears to be slowing, and use may even be increasing. Between 2009 and 2010 daily marijuana use increased among 8th, 10th, and 12th graders. In 2010, 6 percent of 12th graders reported using marijuana daily, compared to 5.2 percent in 2009.

5. What Are the Short-Term Effects of Marijuana Use? For some people, smoking marijuana makes them feel good. Within minutes of inhaling, a user begins to feel “high,” or filled with pleasant sensations. THC triggers brain cells to release the chemical dopamine. Dopamine creates good feelings— for a short time. But that’s just one effect…

6. Marijuana Affects Marijuana affects memory, judgment, and perception. Under the influence of marijuana, you could fail to remember things you just learned, watch your grade point average drop, or crash a car. Also, since marijuana can affect judgment and decision making, using it can cause you to do things you might not do when you are thinking straight—such as engaging in risky sexual behavior, which can result in exposure to sexually transmitted diseases, like HIV, the virus that causes AIDS, or getting in a car with someone who’s been drinking or is high on marijuana.

7. THC Affects Brain Functioning THC is up to no good in the brain. THC finds brain cells, or neurons, with specific kinds of receptors called cannabinoid receptors and binds to them. Certain parts of the brain have high concentrations of cannabinoid receptors. These areas are the hippocampus, the cerebellum, the basal ganglia, and the cerebral cortex. The functions that these brain areas control are the ones most affected by marijuana. For example, THC interferes with learning and memory—that is because the hippocampus—a part of the brain with a funny name and a big job— plays a critical role in certain types of learning. Disrupting its normal functioning can lead to problems studying, learning new things, and recalling recent events. The difficulty can be a lot more serious than forgetting if you took out the trash this morning, which happens to everyone once in a while. Do these effects persist? We don’t know for sure, but as adolescents your brains are still developing. So is it really worth the risk?

8. Smoking Marijuana Can Make Driving Dangerous The cerebellum is the section of our brain that controls balance and coordination. When THC affects the cerebellum’s function, it makes scoring a goal in soccer or hitting a home run pretty tough. THC also affects the basal ganglia, another part of the brain that’s involved in movement control. These THC effects can cause disaster on the road. Research shows that drivers on marijuana have slower reaction times, impaired judgment, and problems responding to signals and sounds. Studies conducted in a number of localities have found that approximately 4 to 14 percent of drivers who sustained injury or death in traffic accidents tested positive for THC.

9. Marijuana Use Increases Heart Rate Within a few minutes after inhaling marijuana smoke, an individual's heart begins beating more rapidly, the bronchial passages relax and become enlarged, and blood vessels in the eyes expand, making the eyes look red. The heart rate, normally 70 to 80 beats per minute, may increase by 20 to 50 beats per minute or, in some cases, even double. This effect can be greater if other drugs are taken with marijuana.

10. The Brain When people smoke marijuana for years, they can suffer some pretty negative consequences. For example, because marijuana affects brain function, your ability to do complex tasks could be compromised, as well as your pursuit of academic, athletic, or other life goals that require you to be 100-percent focused and alert. In fact, people who use marijuana over the long term self-report less life satisfaction, poorer education, and job achievement, and more interpersonal and mental health problems compared to people who do not use marijuana. Marijuana also may affect your mental health. Studies show that early marijuana use may increase your risk of developing psychosis if you have a genetic vulnerability to the disease. Psychosis is a severe mental disorder in which there is a loss of contact with reality, including false ideas about what is happening (delusions) and seeing or hearing things that aren’t there (hallucinations). Marijuana also has been associated with depression and anxiety, but more research is necessary to confirm and better understand that relationship

11. Lungs and Airways People who abuse marijuana are at risk of injuring their lungs through exposure to respiratory irritants and carcinogens found in marijuana smoke. The smoke from marijuana contains some of the same chemicals found in tobacco smoke; plus, marijuana users tend to inhale more deeply and hold their breath longer, so more smoke enters the lungs. Not surprisingly, people who smoke marijuana have some of the same breathing problems as those who smoke tobacco—they are more susceptible to chest colds, coughs, and bronchitis than people who do not smoke. And, even though we don’t know yet whether or how marijuana use affects the risk for lung and other cancers—why take the risk?

12. Addiction Many people don’t think of marijuana as addictive—they are wrong. About 9 percent of people who use marijuana become dependent on it. The number increases to about one in six among those who start using it at a young age, and to 25 to 50 percent among daily users. Marijuana increases dopamine, which creates the good feelings or “high” associated with its use. A user may feel the urge to smoke marijuana again, and again, and again to re-create that experience. Repeated use could lead to addiction—a disease where people continue to do something, even when they are aware of the severe negative consequences at the personal, social, academic, and professional levels. People who use marijuana may also experience a withdrawal syndrome when they stop using the drug. It is similar to what happens to tobacco smokers when they quit—people report being irritable, having sleep problems, and weight loss—effects which can last for several days to a few weeks after drug use is stopped. Relapse is common during this period, as users also crave the drug to relieve these symptoms.

13. Does Marijuana Use Lead to the Use of Other Drugs? While most people who smoke marijuana do not go on to use other drugs, long-term studies of high school students show that 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 use and sell other drugs. So, a person who uses marijuana is more likely to be exposed to and urged to try other drugs. The effects of marijuana on the brain of adolescents—still a work in progress—may also affect their likelihood of using other drugs as they get older. Animal studies suggest this to be true, but it is not yet demonstrated in people.

14. What About Medical Marijuana? Under U.S. law since 1970, marijuana has been a Schedule I controlled substance. This means that the drug has no approved medical use. However, there are medications containing synthetic THC, the main active ingredient in marijuana, that are used to treat nausea in cancer patients undergoing chemotherapy, and to stimulate appetite in patients with wasting syndrome—severe, involuntary weight loss—due to AIDS. Since the discovery of the cannabinoid system—receptors in the body that bind THC, and chemicals that act as these receptors— scientists are actively looking for ways to use this system for medical purposes. Several promising compounds are being tested for the treatment of obesity, pain, and other disorders. However, it is unlikely that smoked marijuana will be developed as a medication because of its negative health effects.

15. PRESCRIPTION DRUG ABUSE http://teens.drugabuse.gov/peerx/