Over the past twenty years, analysis into psychedelic and cannabinoid-based remedies for psychological well being issues has quickly expanded.
Classical psychedelics (LSD, psilocybin and DMT) are being investigated as remedies for melancholy and anxiousness (Wickham, 2024) and cannabis-based medicines are being more and more explored for a variety of indications from insomnia to tic issues, and autism (De Bode, 2024).
Because the scientific group grapples with a quickly evolving proof base, contrasting approaches to regulatory approval and authorities coverage have already begun to form public entry. In 2023, Australia turned the primary nation to licence psilocybin as a remedy for melancholy inside psychiatric settings (Henriques, 2023), In the meantime within the UK, cannabis-based medicinal merchandise at the moment are be prescribed by specialist medical doctors, though use is essentially confined throughout the personal sector.
As these beforehand prohibited substances develop into extra utilised, acquainted questions resurface: what are their long-term results on the mind and psychological well being?
A brand new research by Bouso et al (2026) sought to discover this by investigating if long-term customers of hashish and ayahuasca (a natural brew containing DMT) differed to non-users with respect to persona, cognition and psychological well being.
Your mind on medication? Is long-term use of hashish and ayahuasca dangerous?
Strategies
This was a cross-sectional research based mostly in Spain evaluating measures of persona, cognition, and psychological well being between ayahuasca, hashish, and non-regular substance customers.
Ayahuasca customers have been members of the Spanish Santo Daime Church, a spiritual group the place ayahuasca is consumed ceremonially, whereas hashish customers have been members of Catalan cannabis-activist teams.
Members attended a screening go to, then a research go to the place a battery of neuropsychological, persona and psychological well being scales have been accomplished. To be included contributors wanted to be abstinent from ayahuasca for 10 days, and hashish for 30 days previous to the research go to, and have a adverse urine drug take a look at on the day.
To establish how persona, cognition and psychological well being differed throughout the teams, researchers used multinomial linear regression (MLR). To forestall overloading the mannequin with predictors, solely variables that exhibited a near-significant (p<0.1) relationship with consumer group have been included.
Variables have been entered into the MLR in levels (stepwise method). At every stage non-significant predictors have been eliminated. Mannequin match was assessed utilizing the Akaike Data Criterion (AIC) metric. A decrease AIC signifies a greater mannequin match with fewer pointless predictors.
Outcomes
The ultimate pattern comprised 219 contributors: 69 ayahuasca customers, 56 hashish customers and 94 non-regular substance customers. Lifetime publicity indicated long-term use with ayahuasca customers reporting a imply use of practically 190 instances and hashish customers over 33,000 instances.
The ultimate mannequin had an adjusted R2 worth of 28% which means that the included predictors defined 28% of the variability in group membership.
Stage 1: sociodemographic, psychiatric historical past and IQ
Hashish customers have been youthful, extra prone to be male, have decrease academic attainment and better fluid intelligence than non-user controls. Ayahuasca customers have been extra prone to have a earlier melancholy or anxiousness prognosis than non-users. When these variables have been added into the MLR, solely age, intercourse and former melancholy prognosis remained statistically vital predictors of group membership. This preliminary mannequin defined 8% of variability in group membership.
Stage 2: neuropsychological checks
There have been no statistically vital variations throughout consumer teams on measures of government functioning, working reminiscence, selective consideration, cognitive flexibility or choice making. These measures have been subsequently not included within the last mannequin.
Stage 3: psychological well being signs
Hashish customers demonstrated statistically considerably decrease obsessive-compulsive and psychoticism scores than non-users. Nonetheless, none of those associations remained vital as soon as entered into the MLR and have been subsequently not retained, suggesting the presence of psychological well being signs was much less essential for distinguishing teams.
Stage 4: schizotypal traits
Ayahuasca customers reported extra uncommon experiences than wholesome controls, whereas hashish customers demonstrated larger impulsive non-conformity and introvertive anhedonia. Inclusion of those variables elevated the proportion of variance in group membership defined to 14.1%.
Stage 5: temperament and character dimensions
Ayahuasca customers demonstrated statistically considerably greater self-transcendence, and decrease persistence and hurt avoidance to wholesome controls. Hashish customers, then again, demonstrated larger novelty searching for than wholesome controls. These variables remained vital within the MLR and inclusion elevated the defined variance to roughly 28%. This implies that variations in temperament and character dimensions accounted for essentially the most variation in group membership.
This cross-sectional research in contrast cognition, persona and psychological well being in long-term ayahuasca customers, hashish customers and non-users, discovering that persona traits greatest distinguished the teams.
Conclusions
Bouso et al. (2026) in contrast long-term ayahuasca customers, hashish customers and non-users on measures of cognition, psychological well being and persona. Whereas consumer teams had substantial lifetime substance use, no variations have been recognized in checks of government functioning, working reminiscence, consideration or decision-making.
Persona measures that assessed temperament and character dimensions defined the most important variation in group membership. Ayahuasca customers demonstrated greater self-transcendence and decrease persistence and harm-avoidance to non-users, whereas hashish customers demonstrated larger novelty searching for.
Persona, moderately than cognition or present psychological well being signs, was most strongly related to long-term ayahuasca and hashish use.
Strengths and limitations
Learning the long-term results of a drug is difficult. Customers usually devour a number of substances, differ in essential sociodemographic traits, and should have co-morbid psychological well being circumstances. In an try to minimise the affect of those confounding variables, Bouso et al. (2026) adopted a singular naturalistic design, recruiting contributors from established social teams the place ayahuasca (Santo Daime church) or hashish (hashish activist networks) use was an built-in cultural follow.
Whereas this method strengthens the research by improved ecological validity by capturing functioning people with real-world publicity moderately than skewed treatment-seeking populations, it possible launched choice bias. Non secular organisations and activist networks might entice people with distinct beliefs, values and attitudes impartial of substance use. Consequently, though the noticed persona profiles have been according to earlier analysis (greater self-transcendence in ayahuasca customers and novelty searching for in hashish customers), it’s unclear whether or not these variations replicate group membership or the long-term results of the drug. With out potential evaluation, the course of causality can’t be inferred. The distinctive recruitment technique might also restrict the generalisability of the findings to individuals who use these substances outdoors these communities.
Whereas the distinct recruitment technique aimed to cut back the incidence of polysubstance use, contributors additionally reported utilizing different substances. This isn’t an uncommon discovering in drug analysis. Right here, greater than 40% of hashish customers reported MDMA or cocaine use within the earlier month and 42% of ayahuasca customers reporting hashish use within the final month. Though the frequency of use of those substances was not reported, these ranges of polysubstance use are usually not insignificant and should have contributed to the findings. Moreover, whereas the recruitment method was supposed to enhance matching teams on age, intercourse, training and psychological well being historical past, variations between teams remained, with age, intercourse and former melancholy being retained within the last mannequin.
Regardless of these limitations, the authors ought to be recommended for his or her efforts to minimise acute drug results by requiring each an abstinence interval and a adverse drug take a look at earlier than participation. That is notably essential when investigating cognition, as earlier meta-analyses recommend that many cognitive deficits related to hashish use diminish following extended abstinence (Schreiner & Dunn, 2012). That mentioned, the 10-day abstinence interval for ayahuasca customers was supposed to cut back acute results, nonetheless it stays unclear whether or not subacute modifications in neuroplasticity might nonetheless have influenced cognition or psychological well being outcomes (De Vos et al., 2021).
Moreover, the authors used a complete evaluation battery incorporating a number of validated checks assessing quite a lot of cognitive domains, alongside questionnaires measuring psychopathology and persona. This allowed the authors to check a number of competing explanations for group variations inside a single analytical framework.
Recruiting ayahuasca customers from non secular communities and hashish customers from activist networks improved ecological validity, however limits the extent to which these findings might be generalised to different customers.
Implications for follow
In 1987, anti-drug campaigners in america ran an commercial evaluating the results of medicine on the mind to frying an egg.
Whereas Bouso et al.’s research challenges this simplistic message, discovering no vital variations throughout a spread of neuropsychological checks, the outcomes require cautious interpretation. Sure, ayahuasca and hashish customers on this research didn’t differ from controls on measures of working reminiscence, government functioning, selective consideration or cognitive flexibility. Nonetheless, this doesn’t essentially imply these substances don’t have any long-term cognitive results.
On the one hand, Bouso et al.’s cognitive findings align with earlier hashish analysis suggesting that cognitive deficits might diminish following extended abstinence (Schreiner & Dunn, 2012). Nonetheless, earlier critiques point out that cannabis-related cognitive outcomes could also be affected by age of onset, frequency of use, THC dose and co-occurring psychological well being difficulties (Kroon et al., 2021). As this was a cross-sectional research recruiting socially built-in customers, it’s potential that people who skilled dangerous cognitive or psychological well being penalties arising from hashish have been much less prone to be recruited as a result of that they had already stopped utilizing hashish or have been now not a part of these socially built-in communities. Subsequently, the research’s pattern might signify a subgroup of customers who can tolerate these substances or who had greater baseline cognitive functioning, maybe mirrored by the excessive fluid intelligence noticed amongst hashish customers.
Whereas the restrictions of the persona findings have already been mentioned, the variations noticed between ayahuasca and hashish customers are notably fascinating provided that particular person variations might affect one’s response to psychoactive substances. It is a central assumption in psychedelic analysis, the place “set” (a person’s mindset, expectations and persona) and “setting” (the social, cultural and bodily surroundings wherein a substance is taken) have been hypothesised to affect the acute drug experiences – though this has largely lacked empirical testing (Carhart-Harris et al., 2018). Subsequently, when character dimensions resembling self-transcendence are greater in ayahuasca customers this will not merely signify an impact of the drug or the kind of individual drawn to ayahuasca. As a substitute, it might replicate an interplay between persona, the cultural context of use, and the drug’s pharmacological results. This interplay might have essential scientific implications as psychedelic- or cannabis-based remedies enter scientific follow, with sure people doubtlessly being extra prone to search explicit substances and to expertise each desired therapeutic and hostile outcomes.
To disentangle these prospects, long-term potential analysis is required to find out if persona traits predict subsequent substance use, and whether or not repeated publicity can itself produce lasting psychological modifications. Understanding who takes these substances, the context wherein they’re consumed, and the way people make which means from these experiences could also be simply as essential as understanding the pharmacological results of the substances themselves.
These findings recommend that deciding on the precise sufferers for psychedelic and cannabis-based therapies might require consideration of persona and context, not simply the pharmacology of the drug.
Assertion of pursuits
Matthew Cohen doesn’t know the researchers concerned on this research. He has been a research medic in psychedelic trials and has acquired fee for that work. AI was used to assist polish the textual content of this text to enhance readability.
Editor
Edited by Éimear Foley. ChatGPT assisted with language refinement and formatting through the editorial section.
Hyperlinks
Major paper
José Carlos Bouso, Jordi Riba et al (2026) Persona, not cognition, distinguishes persistent ayahuasca and hashish customers from non-users. European Neuropsychopharmacology 106, 112782. https://doi.org/10.1016/j.euroneuro.2026.112782
Different references
Wickham R. Psychedelics and psychological well being: can the sphere ship on its promise? The Psychological Elf, 2024.
Nationwide Elf Service weblog
De Bode N. Medical cannabinoids as a remedy for psychological well being: useful or hazardous? The Psychological Elf, 2024.
Nationwide Elf Service weblog
Henriques M. Australia turns into first nation to recognise psychedelics as medicines. BBC Information, 1 Jul 2023.
BBC Information article
Schreiner A.M, Dunn M.E. (2012) Residual results of hashish use on neurocognitive efficiency after extended abstinence: a meta-analysis. Experimental and Scientific Psychopharmacology 20(5), 420–429. Full textual content
De Vos C.M, Mason N.L, Kuypers Okay.P.C. (2021) Psychedelics and neuroplasticity: a scientific assessment unraveling the organic underpinnings of psychedelics. Frontiers in Psychiatry 12, 724606. Full textual content
Kroon E, Kuhns L, Cousijn J. (2021) The short-term and long-term results of hashish on cognition: current advances within the subject. Present Opinion in Psychology 38, 49–55. Full textual content
Lorenzetti V, Hoch E, Corridor W. (2020) Adolescent hashish use, cognition, mind well being and academic outcomes: a assessment of the proof. European Neuropsychopharmacology 36, 169–180. Full textual content
Griffiths R.R, Richards W.A, McCann U. et al (2006) Psilocybin can event mystical-type experiences having substantial and sustained private which means and non secular significance. Psychopharmacology 187(3), 268–283. Full textual content
Carhart-Harris R.L, Roseman L, Haijen E. et al (2018) Psychedelics and the important significance of context. Journal of Psychopharmacology 32(7), 725–731. Full textual content
