Marijuana refers to the dried leaves, flowers, stems, and seeds from the hemp plant, Cannabis sativa. The plant contains the mind-altering chemical delta-9-tetrahydrocannabinol (THC) and other related compounds. Extracts with high amounts of THC can also be made from the cannabis plant (see “Marijuana Extracts” below).
Marijuana is the most commonly used illicit drug in the United States.1 It is widespread among young people. According to a yearly survey of middle and high school students, rates of marijuana use have steadied in the past few years after several years of increase. However, the number of young people who believe marijuana use is risky is decreasing.2
Legalization of marijuana for medical use or adult recreational use in a growing number of states may affect these views. Read more about marijuana as medicine in DrugFacts: Is Marijuana Medicine? atwww.drugabuse.gov/publications/drugfacts/marijuana-medicine.
People smoke marijuana in hand-rolled cigarettes (joints), pipes, or water pipes (bongs). They also smoke it in blunts—emptied cigars that have been partly or completely refilled with marijuana. To avoid inhaling smoke, more people are using vaporizers. These devices pull the active ingredients (including THC) from the marijuana and collect their vapor in a storage unit. A person then inhales the vapor, not the smoke.
Users can mix marijuana in food (edibles), such as brownies, cookies, or candy, or brew it as tea. A newly popular method of use is smoking or eating different forms of THC-rich resins (see “Marijuana Extracts” below).
Smoking THC-rich resins extracted from the marijuana plant is on the rise. Users call this practice dabbing. People are using various forms of these extracts, such as:
These extracts can deliver substantial amounts of THC to users, and their use has sent some people to the emergency room. Another danger is preparing these extracts, which usually involve butane (lighter fluid). Many people who have used butane to make extracts at home have caused fires and explosions, resulting in severe burns.
Marijuana has both short- and long-term effects on the brain.
When a person smokes marijuana, THC quickly passes from the lungs into the bloodstream. The blood carries the chemical to the brain and other organs. The body absorbs THC more slowly when the person eats or drinks it. In that case, the user generally feels the effects after 30 minutes to 1 hour.
THC acts on specific brain cell receptors that ordinarily react to natural THC-like chemicals in the brain. These natural chemicals play a role in normal brain development and function.
Marijuana over-activates parts of the brain that contain the most receptors – causing the “high” users to feel. Other effects include:
Marijuana also affects brain development. When marijuana users begin using as teenagers, the drug may reduce thinking, memory, and learning functions and affect how the brain builds connections between the areas necessary for these functions.
Marijuana’s effects on these abilities may last a long time or be permanent.
For example, a study showed that people who started smoking marijuana heavily in their teens and had an ongoing cannabis use disorder lost an average of eight IQ points between ages 13 and 38. The lost mental abilities did not fully return in those who quit marijuana as adults. Those who started smoking marijuana as adults did not show notable IQ declines.3
THC in marijuana has been increasing steadily over the past few decades.4 For a new user, this may mean exposure to higher THC levels with a greater chance of a harmful reaction. Higher THC levels may explain the rise in emergency room visits involving marijuana use.
The popularity of edibles also increases the chance of users having harmful reactions. Edibles take longer to digest and produce a high. Therefore, people may consume more to feel the effects faster, leading to dangerous results.
Dabbing is yet another growing trend. More people are using marijuana extracts that provide more potent doses and, therefore, more substantial effects of THC (see “Marijuana Extracts” above). Higher THC levels may mean a greater addiction risk if users regularly expose themselves to high doses.
Marijuana use may have a wide range of physical and mental effects.
Breathing problems. Marijuana smoke irritates the lungs, and frequent marijuana smokers can have the same breathing problems as tobacco smokers. These problems include daily cough and phlegm, frequent lung illness, and a higher risk of lung infections. Researchers still do not know whether marijuana smokers have a higher risk for lung cancer.
Increased heart rate. Marijuana raises heart rate for up to 3 hours after smoking. This effect may increase the chance of a heart attack. Older people and those with heart problems may be at higher risk.
Problems with child development during and after pregnancy. Marijuana use during pregnancy is linked to an increased risk of brain and behavioral problems in babies. If a pregnant woman uses marijuana, the drug may affect certain developing parts of the fetus’s brain. The resulting challenges for the child may include problems with attention, memory, and problem-solving. Additionally, some research suggests that moderate amounts of THC are excreted into the breast milk of nursing mothers. The effects on a baby’s developing brain are still unknown.
Long-term marijuana use has been linked to mental illness in some users, such as temporary hallucinations—sensations and images that seem real though they are not; temporary paranoia—extreme and unreasonable distrust of others; worsening symptoms in patients with schizophrenia (a severe mental disorder with symptoms such as hallucinations, paranoia, and disorganized thinking); Marijuana use has also been linked to other mental health problems, such as depression, anxiety, and suicidal thoughts among teens. However, study findings vary.
Compared to nonusers, heavy marijuana users more often report the following:
Users also report less academic and career success. For example, marijuana use is linked to a higher likelihood of dropping out of school.5 It is also linked to more job absences, accidents, and injuries.6
Some research suggests that marijuana use is likely to come before the use of other drugs.7 Marijuana use is also linked to addiction to other substances, including nicotine. In addition, animal studies show that the THC in marijuana makes other drugs more pleasurable to the brain.8
Although these findings support the idea of marijuana as a “gateway drug,” most people who use marijuana don’t go on to use other “harder” drugs. Read more about marijuana as a gateway drug in the Marijuana Research Report at www.drugabuse.gov/publications/research-reports/marijuana/letter-director.
Contrary to common belief, marijuana can be addictive. Research suggests that 30 percent of users may develop some degree of problem use, which can lead to dependence and, in severe cases, takes the form of addiction.9 People who begin using marijuana before age 18 are 4 to 7 times more like than adults to develop problem use.10 Dependence becomes an addiction when the person can’t stop using marijuana even though it interferes with their daily life.
Long-term marijuana users trying to quit report withdrawal symptoms that make quitting difficult. These include:
Behavioral support has been effective in treating marijuana addiction. Examples include therapy and motivational incentives (providing rewards to patients who remain substance free). No medications are currently available to treat marijuana addiction. However, continuing research may lead to new medicines that help ease withdrawal symptoms, block the effects of marijuana, and prevent relapse.
For more information about marijuana and marijuana use, visit: www.drugabuse.gov/drugs-abuse/marijuana and www.drugabuse.gov/publications/drugfacts/drugged-driving
For more information about marijuana as medicine and about state laws related to marijuana, visit: www.drugabuse.gov/publications/drugfacts/marijuana-medicine and www.whitehouse.gov/ondcp/state-laws-related-to-marijuana
Source: National Institute on Drug Abuse; National Institutes of Health; U.S. Department of Health and Human Services.
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