The lost mental abilities didn't fully return in those who quit marijuana as adults. Researchers are still studying how long marijuana's effects last and whether some changes may be permanent.įor example, a study from New Zealand conducted in part by researchers at Duke University showed that people who started smoking marijuana heavily in their teens and had an ongoing marijuana use disorder lost an average of 8 IQ points between ages 13 and 38. When people begin using marijuana as teenagers, the drug may impair thinking, memory, and learning functions and affect how the brain builds connections between the areas necessary for these functions. Marijuana also affects brain development.
psychosis (risk is highest with regular use of high potency marijuana).hallucinations (when taken in high doses).difficulty with thinking and problem-solving.altered senses (for example, seeing brighter colors).Marijuana over activates parts of the brain that contain the highest number of these receptors. These natural chemicals play a role in normal brain development and function. THC acts on specific brain cell receptors that ordinarily react to natural THC-like chemicals. In that case, they generally feel the effects after 30 minutes to 1 hour. The body absorbs THC more slowly when the person eats or drinks it. The blood carries the chemical to the brain and other organs throughout the body. When a person smokes marijuana, THC quickly passes from the lungs into the bloodstream.
Image by NIDA THC acts on numerous areas in the brain (in yellow). Read more about marijuana as medicine in our DrugFacts: Marijuana as Medicine. Legalization of marijuana for medical use or adult recreational use in a growing number of states may affect these views.
In 2022, nearly 20.6% of 12th graders reported that they vaped marijuana in the past year and 2.1% reported that they did so daily. In addition, many young people also use vaping devices to consume cannabis products. In 2022, 30.7% of 12th graders reported using marijuana in the past year and 6.3% reported using marijuana daily. 1 According to the Monitoring the Future survey, rates of past year marijuana use among middle and high school students have remained relatively steady since the late 1990s. In 2021, 35.4% of young adults aged 18 to 25 (11.8 million people) reported using marijuana in the past year. Extracts can also be made from the cannabis plant (see " Marijuana Extracts").Īccording to the National Survey on Drug Use and Health, cannabis (marijuana) is one of the most used drugs in the United States, and its use is widespread among young people. The plant contains the mind-altering chemical THC and other similar compounds. Marijuana refers to the dried leaves, flowers, stems, and seeds from the Cannabis sativa or Cannabis indica plant.
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