Cannabis Use Rises Among Individuals with Psychosis Following โฃStateโ Legalization, Raising Concerns for mental health โProfessionals
BOSTON – A โnew study reveals a meaningful increase โขinโข cannabis use among adults with a history of psychosis โขfollowing the legalization of recreational marijuana, sparking concern among psychiatrists andโ researchers about potential worsening of mental โhealth outcomes. The research,published in JAMA Psychiatry,analyzed data from 1,856 adults with โa โlifetime historyโ of psychosisโข through the Population assessment of Tobacco โขand Health Study (PATH),a โฃcollaboration โbetween the Food and drug โManagement and the National Institutes of Health.
The studyโข found cannabis use increased by nearly 10%โ five years after โstates legalized recreational marijuana โฃuse.โค While the โmajority of cannabis users do not develop psychosis, โฃexperts emphasize a well-established link between the drug โand an โincreased โฃrisk of โdeveloping the โขcondition earlier inโ life and experiencing a more severe course.
“Users have more severe hallucinations,delusions,worse disability,lower medication adherence,moreโข admissions,[and] need higher doses,” explained Matthew Large,a โฃpsychiatrist and professor at theโฃ University โขofโ New Southโ Wales in Sydney,Australia.
Researchers noted they were unable to determineโข the potency of the cannabis used by participants, or whether โคincreased useโ directly correlated with declining mental health. However,โฃ the study highlights a concerning trend, especiallyโ as the commercialization of cannabisโข in retail โshops appears to be โฃdriving theโฃ increase in use, rather than simply more frequent consumption. The dataโค showed that while use increased, the frequency of use among those with psychosis did not.
The rapid โฃproliferation of legal cannabis has outpaced โขregulatory efforts, with only two states currently requiring warnings about the link between high-potency cannabis productsโฃ and psychosis, according to a 2024 study. Experts suggest potency caps and health warnings couldโ help mitigate potential โขharms.
The study’s authors acknowledge limitations, including an overrepresentation of women in the sampleโ and relianceโ on self-reported psychosis diagnoses. โค Lead researcher Dr. Hyatt explained theโฃ study was motivatedโ by a desire to understand the impact of legalization on a โคpopulation already facingโ significant challenges in accessing adequate mental healthcare. โ
“There โisโข a somewhat randomized naturalโค experiment happening acrossโค states with states having very diffrent laws,”โค hyatt said.he also expressed a need for further research, particularly focusing on โขthe โขrise of high-potency cannabis products, stating, “I would love, going forward, โforโค other datasetsโข [than the PATH] toโฃ study this.”
The biological mechanisms linking cannabis use and psychosis remain unclear, โpromptingโ ongoing examination into the complex relationshipโข between the drug and mental health.