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How does smoking marijuana affect academic performance? Two researchers explain how it can alter more than just moods

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Research has consistently shown that  people report using marijuana  in order to feel the high, experience enhanced feelings, increase social connections or cope with certain feelings and moods.

Among young adults  early in the pandemic , there were modest reductions in motivations for using marijuana for celebratory reasons and slight increases toward using marijuana because of boredom, possibly due to initial physical distancing mandates and stay-at-home orders. However, among the main reasons for using, both before the pandemic and during as well, are feelings of enjoyment or the high associated with marijuana use. We do not yet know the impact of these shifting motivations for using marijuana or whether patterns seen during the pandemic will continue after.

How many college students are actually using cannabis?

With  18 states  legalizing cannabis for non-medical or “recreational” purposes – the first of which did so in 2012 – access to marijuana has increased, especially for college students over 21 years of age. While the past three reports from  Monitoring the Future  – a national drug use survey conducted annually by the University of Michigan – have shown that between 43% and 44% of college students report any cannabis use in the past year, over half of college students do not report use. This is important to note because research has shown that when people think “everyone” is doing something, they are more likely to start doing it themselves or  do it more .

Different from any use in the past year, researchers often look at past month use as an indicator of current use. Given that about  25% of college students report use in the past month , this suggests that three-quarters of students do not report past month use, and not using marijuana is actually the most common behavior.

How does smoking weed affect academic performance?

As researchers who work with college students, we hear students say things like marijuana is “safe,” “natural” or that it’s “just weed,” but  research  tells a very different story about potential risks. This is particularly true with the high potency cannabis that  dominates markets in legal and medical states .

Published research consistently shows that the more frequently a college student uses cannabis, the  lower their GPA  tends to be, the more they report  skipping class  and the longer it takes them to  graduate .Probably the most direct impact to academic performance is a relationship between marijuana use and impaired attention and memory. This relationship has been documented for years, including with  college students .

The good news is that studies that follow people as they abstain show that when marijuana use stops,  cognitive performance improves , though it can take 28 days of abstinence. So much of this depends on how often someone uses and the type or potency of marijuana they are using. But whatever the case, it certainly seems that the more frequently people use, the more likely they are to experience challenges with attention, memory and other cognitive abilities.

In an  August 2021 article about recommended guidelines for lower-risk cannabis use , the authors concluded that people who use cannabis and experience impaired cognitive performance should think about taking a break or significantly reducing how much they use, or the potency of what they use.

Are there any academic or educational benefits?

In our conversations with college students, we hear some students who typically use marijuana say that when they don’t use, they can’t sit still, or they feel restless and anxious. These students might assume that marijuana use is “helping” them.

Unfortunately, the anxiety and restlessness they experience when not using marijuana can be symptoms of withdrawal. Those things could also be indicative of addiction to cannabis, or what is called a  cannabis use disorder . This might mean when students continue to use marijuana, they might feel a sense of less anxiety or restlessness, but are actually making withdrawal symptoms stop by resuming use.

We are not aware of any studies that point to academic or educational benefits of using marijuana.

Are we forgetting anything?

Science has to play catch-up on the cannabis products being sold today. Among the many cannabinoids in cannabis, THC, the psychoactive component typically associated with the “high” from marijuana, is arguably the most well studied. In the U.S., THC concentrations in the 1970s on average were  under 2% , reached  3% in the 1980s , were  4% by the mid-1990s  and steadily climbed to  almost 15% by 2018 .

Today, especially in legal markets, we are seeing even higher concentrations. For example, in Washington state, flower products – that is, marijuana that is smoked –  commonly exceed 20% THC . Concentrates, which include dabs, hash oil and other products,  routinely exceed 60% THC .

“High potency” cannabis is considered to be anything  over 10% THC . Use of high potency cannabis is associated with a number of outcomes, including greater risk of cannabis use disorder and adverse mental health outcomes.Young people seem to be  particularly vulnerable . Although we sometimes hear from people that marijuana use doesn’t seem that risky, recent studies make clear that cannabis use  may increase harms and risks for those who use . For college students, these issues range from having  trouble concentrating and paying attention to feeling antisocial or paranoid .

Jason R. Kilmer , Associate Professor of Psychiatry & Behavioral Sciences, University of Washington; and Christine M. Lee , Research Professor of Psychiatry and Behavioral Sciences, University of Washington.

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