Marijuana raises heart rate for up to 3 hours after smoking. Researchers so far haven't found a higher risk for lung cancer in people who smoke marijuana. These problems include daily cough and phlegm, more frequent lung illness, and a higher risk of lung infections. Marijuana smoke irritates the lungs, and people who smoke marijuana frequently can have the same breathing problems as those who smoke tobacco. Marijuana use may have a wide range of effects, both physical and mental. What are the other health effects of marijuana? Higher THC levels may also mean a greater risk for addiction if people are regularly exposing themselves to high doses. Therefore, people may consume more to feel the effects faster, leading to dangerous results.
Edibles take longer to digest and produce a high. The popularity of edibles also increases the chance of harmful reactions. Higher THC levels may explain the rise in emergency room visits involving marijuana use. 7 For a person who's new to marijuana use, this may mean exposure to higher THC levels with a greater chance of a harmful reaction. The amount of THC in marijuana has been increasing steadily over the past few decades. Read more about the ABCD study on our Longitudinal Study of Adolescent Brain and Cognitive Development (ABCD Study) webpage. 6 NIDA’s Adolescent Brain Cognitive Development (ABCD) study, a major longitudinal study, is tracking a large sample of young Americans from late childhood to early adulthood to help clarify how and to what extent marijuana and other substances, alone and in combination, affect adolescent brain development. This suggests that the IQ decline in marijuana users may be caused by something other than marijuana, such as shared familial factors (e.g., genetics, family environment). In another recent study on twins, those who used marijuana showed a significant decline in general knowledge and in verbal ability (equivalent to 4 IQ points) between the preteen years and early adulthood, but no predictable difference was found between twins when one used marijuana and the other didn't. Those who started smoking marijuana as adults didn't show notable IQ declines. 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.
In addition, the number of young people who believe regular marijuana use is risky is decreasing. With the growing popularity of vaping devices, teens have started vaping THC (the ingredient in marijuana that produces the high), with nearly 4% of 12th graders saying they vape THC daily. 1 According to the Monitoring the Future survey, rates of past year marijuana use among middle and high school students have remained steady, but the number of teens in 8th and 10th grades who say they use it daily has increased.
In 2018, more than 11.8 million young adults used marijuana in the past year. 1 Its use is widespread among young people. Marijuana is the most commonly used addictive drug after tobacco and alcohol. Extracts can also be made from the cannabis plant (see " Marijuana Extracts"). 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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