Weed Use Does Not Have Harmless Effects on Brain Health
“Because the structural changes of weed use (hippocampus, orbitofrontal cortex, amygdala, white matter, etc. more in AI summary/article) result in altered brain function such as reduced memory ability, attention, adhd symptoms, processing speed, emotional processing, reward processing, it makes sense to greatly reduce and moderate weed usage. While on weed, I personally do notice not being quite as fast in brain speed and my working/short term memory. I will tend to not want to do anything with moderate or high effort. After coming down, I still have some of that for an hour or two. If I have been using it chronically, I have noticed that it will take a few days to come back to normal. I don't feel different or in an altered state of mind while on it; the best way I can explain weed is feeling more of what you're already feeling. The only bad effect of weed I have ever felt is what is commonly known as "greening out" after taking a large dose, which is essentially nausea for me. It went away after I left the moving car (which I was not driving) and to get fresh air. Additionally, I've never felt an addiction to weed. I can and have gone 90 days and more without weed with and without intention. I am not dependent on it and can live my life without using weed. I do not feel the "need" to have weed in my life to any degree. I have never felt that weed is taking over my life. I have always generally agreed with the stereotype that weed makes you lazy and more of a loser. I plan to have and have already had times in my life where I care extremely about not touching weed. That is where the effects end. Cannabis is not damaging to my physical body or brain health. There is no scientific basis for cannabis itself causing temporary or permanent, short or long term, harmful effects on the brain. The structural changes in the brain are not a cause for concern, as no two brain structures are the same, and the brain is still healthy. According to the studies, when the user reduces their cannabis intake, their brain structure will also reflect that by reverting to its normal state. The brain is always changing structure and developing. The changes in brain structure are not permanent. There is no scientific evidence that cannabis itself creates mental illness, because it is not temporarily altering the brain in a damaging way. It is sort of like changing life perception settings. It is not contributing to an early death. The age concern regarding weed is about amplifying the effects that are listed; not anything different that would hurt the brain. Same with modern day potency; amplifying the effects we know of, not anything different. Potency is the same as increasing/decreasing dosage. Weed gives bad highs or exacerbates conditions only to those who have pre-existing mental illnesses. Paranoia, schizophrenia, psychosis, cognitive decline/dementia, etc. Lastly, I have never experienced issues with my long term memory recall; I have always had a good memory and truly value that. If I notice it changing I would temporarily eliminate weed to see if it improves and then moderate or completely remove it from there. Also, you cannot "OD" on weed. To date, there have not been any reported deaths resulting solely from cannabis use according to CDC data. That alone makes it fundamentally hugely different from other drugs and alcohol.”
Summary
Scientific research shows that heavy or early cannabis use can lead to persistent changes in brain structures such as the hippocampus and orbitofrontal cortex, which are linked to deficits in memory, attention, processing speed, and increased risk of psychosis and schizophrenia. While some findings suggest possible reversibility with reduced use, the evidence of lasting cognitive and structural effects contradicts the claim that cannabis has no harmful impact on the brain. Additionally, although cannabis alone rarely causes fatal overdose, it can contribute to serious health issues, especially in vulnerable individuals.
Sources 58 searched
- Cannabis effects on brain structure, function, and cognition: considerations for medical uses of cannabis and its derivatives - PMC
Early, heavy use may then interfere with educational and vocational training, leading to long-term consequences in adulthood. From a more biological perspective, use of cannabis during critical developmental periods may cause persistent, long-term alterations in brain structure and brain function.
- Long-term effects of marijuana use on the brain - PMC
These changes have been observed ... across cognitive domains in both adult and adolescent cannabis users (3–6), structural changes associated with marijuana use have not been consistent....
- The Effect of Cannabis on the Brain: Can it cause brain anomalies that lead to increased risk for Schizophrenia? - PMC
Recent studies have produced ... evidence that exists, it appears that the above view is unlikely and that cannabis may even have benign effects on brain structure, not producing deleterious damage....
- Lifetime Cannabis Use Is Associated with Brain Volume and Cognitive Function in Middle-Aged and Older Adults - PubMed
Results: Lifetime cannabis use was positively associated with regional brain volume in CB1-rich regions, including the caudate, putamen, hippocampus, and amygdala. Greater lifetime use was also linked to better performance in learning, processing ...
- Associations of cannabis use, tobacco use and co-use with brain volume: A systematic review and meta-analysis - PubMed
We aimed to review studies investigating cannabis use, tobacco use, their co-use and brain volume and triangulate evidence across different study designs. Methods: A systematic review and meta-analysis preregistered on PROSPERO (CRD42022356982) and reported according to PRISMA 2020 guidelines.
- The effect of cannabis on the brain: can it cause brain anomalies that lead to increased risk for schizophrenia? - PubMed
Summary: From the evidence that exists, it appears that the above view is unlikely and that cannabis may even have benign effects on brain structure, not producing deleterious damage.
- Cannabis use and risk of schizophrenia: a Mendelian randomization study | Molecular Psychiatry
Cannabis use is observationally associated with an increased risk of schizophrenia, but whether the relationship is causal is not known. Using a genetic approach, we took 10 independent genetic variants previously identified to associate with ...
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