Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after quitting. The damage was most severe in those who started using cannabis as teenagers. https://t.co/Y3eWIrPPJE
Persistent cannabis users show neuropsychological decline from childhood to midlife.
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Jan 2019 – Dec 2025Where it's discussed
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AI synopsis
What people are saying
The discussions highlight concerns about the cognitive effects of cannabis, with several posts mentioning specifics such as an average loss of 6 to 8 IQ points that persists even after quitting. Others comment on the study’s implication for adolescent users, emphasizing terms like 'brain damage' and 'neurotoxic effects.' The tone throughout is generally serious, underscoring the perceived need for preventative measures, which contributes to a strong sentiment about the research’s potential impact on public health discussions.
A majority of discussions express a consensus regarding the negative effects of persistent cannabis use, though some posts challenge these findings.
There is a high degree of interest in the research, as many participants cite specific studies and share related personal insights.
While many discussions provide support or critique of the research, some users simply dismiss it, leading to a mixed depth of engagement.
Most users believe the findings of the study could significantly influence public perception and policy regarding cannabis use, particularly among adolescents.
Abstract in brief
- Persistent cannabis use leads to noticeable neuropsychological decline from childhood to midlife, particularly among those who start using during adolescence.
- The study followed a cohort from age 13 to 38, revealing that cognitive impairments were reported by both users and informants, even after accounting for education levels.
- Cessation of cannabis use did not fully reverse the cognitive deficits, emphasizing the need for targeted prevention and policy measures aimed at adolescents.
Top posts
Most liked on X and Bluesky精神的に崩壊するとか
Persistent cannabis users loose ≈6 IQ points https://t.co/YfWRHCzTcI
Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the CoverPNAS Plus: Persistent cannabis users show neuropsychological decline from childhood to midlife https://t.co/JcYHg2ruwy
@leandisy @raazure ta bom irmao https://t.co/hNkXqzzzSL e eu só queria que, genuinamente, quem falasse de medicina canabica tivesse noção real de ciência. Medicina Canábica NÃO é o que você acha, tem casos específicos e experimentais, e nem de perto é unanimidade na comunidade científica
According to Neurology Today (Oct 4 2012), smoking marijuana as a teen could lead to lower IQ as an adult according to a decades long study of more than 1000 New Zealanders. title:, “Persistent cannabis users show neuropsychological decline from childhood to midlife.
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@GreatR2030 @banaPete @deZeZed spadek IQ przy używaniu w młodym wieku: https://t.co/BkvsgyszSc Dwuktrotnie wyższe ryzyko raka płuc: https://t.co/RXVMSZZlDh 25% wieksze ryzyko chorób sercowo-naczyniowych przy codziennym używaniu: https://t.co/fFZe7ZyhHm
@WeedDelux Ben non. Cest bien 8 points de QI. https://t.co/Hpv5AxxCfj
@tilt66 @keuslefou @MHadrons @jiaiffert @PanneauMunicip1 Non 8 points https://t.co/Hpv5AxxCfj
@h25954 @MsBlaireWhite Brain Marijuana use causes an average 8-point IQ loss that does not recover after quitting. Meier MH, Caspi A, Ambler A, et al. Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci U S A. 2012;109(40):E2657-E2664.
Selbstverständlich Persistent cannabis users show neuropsychological decline from childhood to midlife | PNAS www.pnas.org/doi/10.1073/...
@AAvs22 @NPA_KOHO 3、Meier, M. H., et al. (2012). タイトル: Persistent cannabis users show neuropsychological decline from childhood to midlife. DOI: 10.1073/pnas.1206820109
3/7 Efectos comunes del uso crónico: → Menor atención sostenida → Alteraciones en memoria de trabajo → Baja tolerancia a la frustración
older lit but still decent; https://t.co/gIs5bDJSGX
@Jcauffen @SamBolsosim vc não aprendeu por causa da maconha, e talvez sem ela seu desempenho melhoraria ;) o uso frequente de maconha iniciado na adolescência esteve associado à redução do QI e prejuízos cognitivos persistentes, diz estudos. https://t.co/Kai645nVen
@hermittoday You think that, because you are dumb, because you smoke weed. https://t.co/Clhe41fIxG You don't really need a longitudinal double-blind trial to notice that weed makes you dumb, but there it goes.
@ClarkeMicah @YouTube +Cannabis smoking 'permanently lowers IQ' (Proceedings of the National Academy of Sciences) +Marijuana Use Linked to Increased Risk of Testicular Cancer That Tends to Strike Ages 20 to 35. (Fred Hutchinson Cancer Research Center) https://t.co/Y56zEj35K9. https://t.co/fIwwbfwDdw
@leandisy @raazure ta bom irmao https://t.co/hNkXqzzzSL e eu só queria que, genuinamente, quem falasse de medicina canabica tivesse noção real de ciência. Medicina Canábica NÃO é o que você acha, tem casos específicos e experimentais, e nem de perto é unanimidade na comunidade científica
RT @taperclinic: Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after q…
RT @taperclinic: Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after q…
RT @taperclinic: Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after q…
Persistent cannabis users show neuropsychological decline from childhood to midlife | PNAS https://t.co/O4hNl4X3H9
RT @taperclinic: Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after q…
RT @taperclinic: Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after q…
Another study found that persistent cannabis use led to neuropsychological decline that did not fully reverse even after quitting. The damage was most severe in those who started using cannabis as teenagers. https://t.co/Y3eWIrPPJE
@libmentalillnes @PLegalization And here's another one. This little bit here discredits the study: "It is possible that differences in test performance between cannabis users and controls are attributable to premorbid rather than cannabis-induced deficits" https://t.co/2ntZiNDXxV
@tilt66 @RMCInfo https://t.co/nP4UJ9YMIp
¿CÓMO EL THC INDUCE ADICCIÓN?
@taytaytaey @dieser_ilse @Anna_Muenchen Hier auf die Schnelle mal ein Artikel: https://t.co/XMdFRZ2Xsy
@liltimi5 @aviahate @Amanda_Cry_sis @ne_tank Если он будет курить, то он будет уничтожать свой мозг. Вот тебе 3 крупных работы, которые обнаружили: снижение когнитивных функций (1), изменение в префронтальной коре и гиппокампе (2) и снижение IQ (3) https://t.co/vOjRGAcoGv https://t.co/fMmMQ813fq https://t.co/NXixay9lKy
@IranemanAzadi @frank_tempel Das war von 2012 https://t.co/H8bFd30oLE und wurde damals schon kritisch beleuchtet, u.a. von Ole Rogeberg https://t.co/JCuTta5QrS
La consommation de cannabis fait perdre des points du QI. Persistent cannabis users show neuropsychological decline from childhood to midlife - PMC https://t.co/Xf8lAZH2vV
RT @AlessandroStru4: Persistent cannabis users loose ≈6 IQ points https://t.co/YfWRHCzTcI
Persistent cannabis users loose ≈6 IQ points https://t.co/YfWRHCzTcI
@waterlover_69 @Justin__NC @MattWalshBlog https://t.co/QXo883G4gi.
@JValchamp @ArthurLannister @Kovda624 Mention spéciale: Sur le long terme le cannabis peut aussi diminuer les capacités cérébrales se reflétant notamment sur une baisse de QI. Ça explique certaines choses. https://t.co/fSH4m1HLfP
@tomangell "Persistent cannabis use was associated with neuropsychological decline broadly across domains of functioning, even after control- ling for years of education. Informants also reported noticing more cognitive problems for persistent cannabis users." https://t.co/WxH2SQGxLN
(Meier et al., 2012) https://t.co/KTpkj3I7Y9 #mentalhealth #mentalhealthmatters #mentalhealthawareness #psychology #research #intelligent #cannabis
@ApriiSR @Robert_AIZI https://t.co/uLMYwffgRD
@BartekKorwin @_konliberal - Meier MH, Caspi A, Ambler A, et al. Persistent cannabis users show neuropsychological decline from childhood to midlife.
@ManlioArt @LCI En 2018 et 2019, des études montrent qu'une consommation régulière de cannabis chez l'adolescent induit une baisse irréversible pouvant atteindre six points de QI https://t.co/j2K6pCLNEE
@HannahBerrelli It’s shocking the extent to which people defend it, when regular use is associated with a decline in cognitive function, especially if encountered earlier in life. For example… https://t.co/5W62JPZTAx I would add the increasing concerntration of thc is a big problem.
RT @RDrachenstern: @VonHeyden @ArminRohde Kiffen mach Dumm
@VonHeyden @ArminRohde Kiffen mach Dumm
@SmE96gLtvY8609 @mememememto 大麻でIQ下がる根拠もありますよ https://t.co/w18KEETeXy その人達に何言っても不毛だよ 俺も絡まれたけど根拠見せても自分の都合悪い内容はスルーだからね 結局大麻容認派は自分達が吸いたいが最優先で都合良く解釈し無知な発言だらけ 低知能が多いからまともな判断も出来ないんだろうね https://t.co/Ay7Lt1Yj25
@MeineMe53821610 @BodenseePolitik @ThomasV94305869 1 Artikel der 2023 erstellt wurde & sich auf Studien aus dem Jahr 2012 & 2015 bezieht, tief für Cherrypicking gegraben
@aberamagremio @caiocezar420 https://t.co/tSgPEPsWqv
RT @DrugPolicyAZ: https://t.co/Q2tNp0YFb7 https://t.co/JpMMaEvH0W
https://t.co/Q2tNp0YFb7 https://t.co/JpMMaEvH0W
RT @TheOutThere2016: @TeamYouTube this has been peered reviewed.. I said some drugs damage brain and some enhance it this again is not medi…
@TeamYouTube this has been peered reviewed.. I said some drugs damage brain and some enhance it this again is not medical advice but it should make you think https://t.co/ttB8E5ggod.
Persistent cannabis users show neuropsychological decline from childhood to midlife | PNAS https://t.co/qcpguxbTNF
@jxhnmcclain https://t.co/JunM58lKm9 https://t.co/vVY0lBEr70 https://t.co/QWv4BQIj54 https://t.co/n9zfe2Lq7N https://t.co/KyN3rDHMgF Solo esos sin entrar en los problemas cerebrovasculares, porqu3 obviamente existen y afectan el desarrollo y funcionamiento del cerebro.
Estudos também indicam uma redução no QI (6-8pts) associada ao uso da substância, que persiste mesmo após a cessação do consumo, além de representar um fator de risco para esquizofrenia - principalmente em homens. https://t.co/LEiDV2QApw https://t.co/vKSDY3inEg #psitwitter
@Phyloroform @HassoSuliak @NZZ https://t.co/3daVWBNSks
@HampunKukka @SinakinB Löytyy toki tällainenkin tutkimus. https://t.co/DzcoTdtpVX
@dieghe78 @celestiaIgirI https://t.co/mjGLBxi3Ta
Cannabis availability? 1. Recently-a NZ Study- persistent Cannabis use in adolescence-loss of an average of 6 to 8 IQ points in mid-adulthood. https://t.co/DRRE24IE95. 2.Use in pregnancy-Evidence of paediatric neurodevelopmental /deficit or delay-RANZCOG advice.
RT @asoneumocito142: Debes saber que los efectos de la marihuana en la atención, la memoria y el aprendizaje pueden durar mucho tiempo o in…
Debes saber que los efectos de la marihuana en la atención, la memoria y el aprendizaje pueden durar mucho tiempo o incluso ser permanentes (Persistent cannabis users show neuropsychological decline from childhood to midlife). Recuerda... mereces un respiro de vida #LaMataSiMata https://t.co/BXK65dhfk4
@TalAloniRozen @martsianoavi במאמר שהתייחסתי אליו (אגב, ניו זילנד ולא אוסטרליה, לא שזה מאוד משנה) לא התייחסנו לעניין המגדר בכלל. אולי בגלל שהרוב המוחלט של המעשנים היו גברים ולכן לא היה להם יכולת להסיק מסקנות לגבי נשים. אני חופר לראות אם אני מוצא משהו אחר https://t.co/84Pya2QVJ0
@ClownWorldAss @juanmescobar @charliekirk11 Meier, M.H., Caspi, A., Ambler, A., et al. (2012). Persistent cannabis users show neuropsychological decline from childhood to midlife. Proceedings of the National Academy of Sciences, 109(40), E2657-E2664. doi: 10.1073/pnas.1206820109
References: [1] https://t.co/5Mm6wEdt8n [2] https://t.co/omhAx0rFAd [3] https://t.co/sSrVHryo9t [4] https://t.co/KDU77u6jA1 [5] https://t.co/JeZ1OAeeGP
@Thrilla_dondada There's actually a study on that. Kids that smoke early in high school usually have problems later. https://t.co/tFpGkxtn8Y
@BvsedDes97 @Notdojaaa https://t.co/0r6i2leBM2
@lauri_linden Kannattaa hieman lukea kirjallisuutta, ennen kuin alkaa tuollaista typeryyttä huudella. Tässä pari juttua… https://t.co/aFHBavhZOy https://t.co/Mjl1Yw2GuE
@utopisterepenti @GVeridis @RomaneManageme1 @collectifPCP Quoique c'est montré que ça aide pas pour l'intelligence : https://t.co/7CEXMJwiAJ
370(23): p. 2219-27. 6.Meier, M.H., et al., Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci U S A, 2012. 109(40): p. E2657-64.
Encuentra más información en: https://t.co/tTZYZggoBz (3/3).
@Samb931 Toinenkin löyty; https://t.co/wq60v2zwOx
@JohnFetterman https://t.co/kpewekE0Hd
@Atmi_2987 @KrzyczacyK1b1c @_0_0_4_ @LukaszBok https://t.co/rQKPUlNL8e Nie wolno krytykowac ziuuułka! wolne joshe
@KrzyczacyK1b1c @_0_0_4_ @LukaszBok https://t.co/rQKPUm5Umm A co do porównania alko vs zioło to nie mam - opieram się w tej materii na doświadczeniach własnych z innymi ludźmi.
@KarmaPolice50 @washingtonpost Maybe because I'm educated to facts? M. Filbey et al., “Long-term effects of marijuana use on the brain,” in Proc Natl Acad Sci U S A, vol. 111, H. Meier et al., “Persistent cannabis users show neuropsychological decline from childhood to midlife,” Proc Natl Acad Sci U S A,
@e_l3el เคยทราบแล้วครับ มีผลต่อ IQ ในระยะยาวถ้าเริ่มใช้ในวัยรุ่น มีงานศึกษามาตั้งแต่ 2012 จากเคสที่ NZ แต่นั้นไม่ได้แปลว่า IQ จะลดลงเสมอหากเริ่มใช้ตอนเป็นผู้ใหญ่ แล้วคนที่ลองเสพย์กัญชาก็ไม่ใช่ว่าจะติดกัญชาทันที หรือ ทุกคนนะครับ https://t.co/7BjwsMB9C7
@mattegeo @age_of_VIRGO @caria_peppe @marcofurfaro @matteosalvinimi Beh, a differenza dei consumatori di cannabis non me la cavo male. ''We found that more persistent cannabis users did show greater IQ decline, with the most persistent users (n = 41) losing an average of 5–6 IQ points from age 13 y to 38 y '' https://t.co/e2dCx5BeTN
@CNN @ForecasterEnten https://t.co/NTa5JLXiNB
@artis_dope @iskhabpal1 And treating your Alzheimers: https://t.co/NTa5JLXiNB
From the CoverPNAS Plus: Persistent cannabis users show neuropsychological decline from childhood to midlife - PMC https://t.co/e7D8Sc9soi
RT @WarrenCoalition: A fact for #NMFW from @JohnnyKStack: FACT #2 – Adolescent marijuana use can cause a decrease in IQ https://t.co/shg7…
RT @WarrenCoalition: A fact for #NMFW from @JohnnyKStack: FACT #2 – Adolescent marijuana use can cause a decrease in IQ https://t.co/shg7…
RT @WarrenCoalition: A fact for #NMFW from @JohnnyKStack: FACT #2 – Adolescent marijuana use can cause a decrease in IQ https://t.co/shg7…
A fact for #NMFW from @JohnnyKStack: FACT #2 – Adolescent marijuana use can cause a decrease in IQ https://t.co/shg7lXeneu https://t.co/fhZkr5H2W1
Recent reports show that fewer adolescents believe that regular cannabis use is harmful to health. Concomitantly, adolescents are initiating cannabis use at younger ages. https://t.co/ZcwFc9obZw #johnnykstack #johnnysambassadors #JohnnyKStack https://t.co/XBGTrtRuOm
@YoSoyJimbooo @mattyglesias The Proceedings of the National Academy of Sciences isn't peer reviewed? https://t.co/0eDN3wUmm3
RT @Costaball: @svgiachero Un estudio en Nueva Zelanda siguieron a 1.037 adolescentes de 13 años hasta que tuvieran 38 años. Descubrieron q…
@svgiachero Un estudio en Nueva Zelanda siguieron a 1.037 adolescentes de 13 años hasta que tuvieran 38 años. Descubrieron que consumo persistente de #Cannabis durante 20 años se asocio con deterioro neurocignitivo y más fuerte si consumo comienza en la adolescencia https://t.co/miync8VyUj
@PamKeithFL Yeah lets decriminalize cannabis: https://t.co/NTa5JLXiNB
El consumo persistente de cannabis se asocia a un deterioro neuropsicológico en adolescentes. En un estudio del 2012, el cese del consumo no restauró por completo el funcionamiento neuropsicológico entre los consumidores que iniciaron en la adolescencia. https://t.co/l7JhyvT5pm
Persistent cannabis users show neuropsychological decline from childhood to midlife - PubMed https://t.co/nhJ64V12Rl
Persistent cannabis users show neuropsychological decline from childhood to midlife https://t.co/uF6BRteLyR
@_I_d_u_n_ the wikipedia article lists one cohort study, doi:10.1073/pnas.1206820109 https://t.co/iFTriEhKGd
@HerbalTrad https://t.co/2idhzjQn2p
@tstopford https://t.co/o5FPsPvFyS and neurological decline for those that persistently use from youth...no worries, it’s only your brain!?
@tstopford @sgowsmith1988 @_chloeswarbrick how about this one Tadgh? https://t.co/o5FPsPvFyS decreased intelligence?? is that what NZ really needs? lol, the garden herb argument is not a great one, tobacco leaves? rosary peas? castor bean? there's plenty of dangerous plants out there that will kill you if you eat them..
@brettcd @_chloeswarbrick @stpaulsauckland @Brettcd is this study ideologically driven? https://t.co/o5FPsPvFyS How about the NZ Medical association stating: “cannabis is a harmful drug both at individual and societal levels” and “opposes legalization”. Does the NZ medical association have alterior motives aside...
@KayJayHarpur @nz_watch @_chloeswarbrick https://t.co/o5FPsPvFyS like this sort of science?
@sgowsmith1988 @_chloeswarbrick https://t.co/o5FPsPvFyS or studies from Otago uni showing when people smoked from their teens this resulted in decreased intelligence? How about that sort of basis?
2/2 like saying "lets have a lolly scramble! but none for you kiddies!" https://t.co/uBgJiayM7U https://t.co/o5FPsPvFyS
Persistent cannabis users show neuropsychological decline from childhood to midlife https://t.co/gSoiU9Nqol
Recreational use just legalized here in IL...Persistent cannabis users show neuropsychological decline from childhood to midlife https://t.co/lEIptNVUgi
@mosesokinyi You can look for this material by Meier MH, Caspi A, Ambler A, et al. Where its mentioned that Persistent cannabis users show neuropsychological decline from childhood to midlife.
RT @minesoh: 精神的に崩壊するとか
@LCP @Enthoven_R Persistent cannabis users show neuropsychological decline from childhood to midlife. Meier MH, et al. Proc Natl Acad Sci U S A. 2012. https://t.co/Lc5Y6PuRfF
RT @minesoh: 精神的に崩壊するとか
Débat sur les méfaits du cannabis / Persistent cannabis users show neuropsychological decline from childhood to midlife https://t.co/MJOvzas56D
RT @minesoh: 精神的に崩壊するとか
RT @happyselvan: According to Neurology Today (Oct 4 2012), smoking marijuana as a teen could lead to lower IQ as an adult according to a d…
According to Neurology Today (Oct 4 2012), smoking marijuana as a teen could lead to lower IQ as an adult according to a decades long study of more than 1000 New Zealanders. title:, “Persistent cannabis users show neuropsychological decline from childhood to midlife.
@sebastianvalen9 @AlbertoBernalLe @petrogustavo Un descenso de 8ptos en IQ. Meier MH, Caspi A, Ambler A, et al. Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci U S A. 2012;109(40):E2657-E2664. doi:10.1073/pnas.1206820109.
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
RT @minesoh: 精神的に崩壊するとか
精神的に崩壊するとか
RT @KabalaBartek: Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the Cover…
RT @KabalaBartek: Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the Cover…
RT @KabalaBartek: Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the Cover…
RT @KabalaBartek: Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the Cover…
RT @KabalaBartek: Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the Cover…
Regularne używanie marihuany powoduje znaczącą utratę IQ i ogólne osłabienie funkcji neuropsychicznych. From the CoverPNAS Plus: Persistent cannabis users show neuropsychological decline from childhood to midlife https://t.co/JcYHg2ruwy
Persistent cannabis users show neuropsychological decline from childhood to midlife. “Findings are suggestive of a neurotoxic effect of cannabis on the adolescent brain and highlight the importance of prevention and policy efforts targeting adolescents.” https://t.co/UBIIQ7wA8m
@akilliu Meier MH, Caspi A, Ambler A, et al. Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci U S A. 2012;109(40):E2657-E2664. doi:10.1073/pnas.1206820109.
@JurgenGunther @FundacionDaya @juanseapi Y el problema es éste: "Recent reports show that fewer adolescents believe that regular cannabis use is harmful to health" Meier et al. Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci U S A. 2012;109(40):E2657-E2664.