February 2026
Cannabis
What February 2026's 12 new studies found, synthesized from the papers below. All Cannabis research →
The synthesis
Synthesized from 12 studies in the library · AI-generated, grounded in the abstracts below
Found by searching the library for Cannabis, marijuana, THC, tetrahydrocannabinol, then ranked by relevance.
In February 2026, cannabis research focused on THC's effects on brain development, behavior, and therapeutic potential. Preclinical studies consistently showed that early-life THC exposure can alter neurodevelopment, motivation, and memory in rodents, with sex-specific effects. Human trials indicated that acute THC can reduce alcohol consumption and affect fear memory in PTSD, but chronic use was not associated with lasting cognitive impairments. The evidence is mixed regarding long-term harms, and most findings come from animal models or short-term human studies, limiting generalizability.
Evidence by study
Direction is which way each study's own result points, not our rating of the study.
What the directions mean
- Supports:
- the study found the intervention worked, or its hypothesis held.
- Opposes:
- it found the opposite, no benefit or a harm.
- No effect:
- no significant difference either way.
- Mixed:
- effects in both directions within the same study.
- Unclear:
- the abstract does not report a direction.
| Study | Design | Sample size | Direction | Finding |
|---|---|---|---|---|
| Which Came First? Utility of Preclinical Models in Cracking the Chicken-or-Egg Relationship between Cannabis Use and Schizophrenia 2026 | review | Supports | This review argues that preclinical rodent models show cannabinoid exposure can alter schizophrenia-like behaviors and neural effects, with outcomes shaped by route, dose, and cannabinoid type. | |
| Prenatal THC exposure and binge-like alcohol drinking in early adolescence: From sex-specific drinking vulnerability to abnormal endocannabinoid-dopamine nexus in the nucleus accumbens. 2026 | preclinical study | Supports | Prenatal THC exposure alters the endocannabinoid-dopamine nexus in the nucleus accumbens, potentially contributing to sex-specific binge-like alcohol drinking vulnerability. | |
| Perinatal exposure to delta-9-tetrahydrocannabinol (THC) alters goal-directed behavior and dopamine functioning in wistar rats. 2026 | preclinical study | Supports | Perinatal THC exposure decreased motivation for high-effort rewards, particularly in males, without altering baseline dopamine release but attenuating the dopaminergic response to cocaine. | |
| Adult Rat Offspring Exposed to THC during Gestation Exhibit Distinct Biomolecular Changes Identified by X-ray Fluorescence Imaging and Fourier Transform Infrared Spectroscopy in Cortico-Limbic Circuits. 2026 | experimental animal study | Supports | Gestational THC exposure led to decreased copper in the corpus callosum and altered lipid and protein composition in brain regions including the hippocampus, corpus callosum, and lateral ventricle. | |
| Cannabis and Psychedelics Among U.S. Young Adults: Use, Messaging Exposure, Perceptions, and Legalization Support 2026 | cross-sectional survey | 3227 | Supports | Lower perceived addictiveness and harm, higher social acceptability, more adverse childhood experiences, more message exposure, and higher mental health symptoms were associated with cannabis and psychedelic use and greater legalization support. |
| Trends in toxicological findings and drug seizures of MDMA in New Zealand from 2010 to 2022 2026 | retrospective analysis of toxicology and seizure data | 324 | Mixed | MDMA was detected in 131 coronial cases and 193 driving cases; most cases involved co-use of other drugs, especially cannabis and alcohol. |
| Personality, not cognition, distinguishes chronic ayahuasca and cannabis users from non-users 2026 | cross-sectional study | 219 | No effect | Chronic use of ayahuasca or cannabis was not associated with detectable lasting neuropsychological impairments in executive and working memory tasks, and personality characteristics most clearly distinguished chronic users from non-users. |
| Involvement of Adenosine A2A Receptors in Anxiety-Like Behaviors in Tetrahydrocannabinol-Treated Mice. 2026 | experimental study | Supports | THC induced anxiety-like behavior, and gene expression patterns indicated a significant interaction between the adenosinergic and cannabinoidergic systems, with THC playing a predominant role in this molecular interplay. | |
| Acute Effects of Cannabis on Alcohol Craving and Consumption: A Randomized Controlled Crossover Trial. 2026 | randomized controlled trial | 138 | Supports | Smoking cannabis with 3.1% or 7.2% THC significantly reduced alcohol consumption compared to placebo, with reductions of 19% and 27%, respectively. |
| Sexually Dimorphic Effects of a Single Neonatal Δ9-tetrahydrocannabinol Exposure on Neuronal Dendritic Morphology and Cognitive Functions in Rats. 2026 | experimental study | Mixed | Neonatal THC exposure induced spatial memory deficits in female but not male rats and reduced dendritic complexity and spine density in cortical and hippocampal neurons of both sexes. | |
| Acute and chronic cannabis vapor exposure produces immediate and delayed impacts on phases of fear learning in a sex specific manner. 2026 | preclinical experimental study | Mixed | Acute cannabis exposure prior to fear conditioning prevented spontaneous recovery of conditioned fear in both sexes, but impaired fear recall in females and had sex-specific effects on extinction. | |
| Dose-dependent effect of acute THC on extinction memory recall and fear renewal: a randomized, double-blind, placebo-controlled study. 2026 | randomized controlled trial | 36 | Supports | Low-dose oral THC (5 mg or 10 mg) prior to extinction learning affected brain indices of fear learning and memory both acutely and one week after administration in adults with PTSD. |
This review argues that preclinical rodent models show cannabinoid exposure can alter schizophrenia-like behaviors and neural effects, with outcomes shaped by route, dose, and cannabinoid type.
review
Prenatal THC exposure alters the endocannabinoid-dopamine nexus in the nucleus accumbens, potentially contributing to sex-specific binge-like alcohol drinking vulnerability.
preclinical study
Perinatal THC exposure decreased motivation for high-effort rewards, particularly in males, without altering baseline dopamine release but attenuating the dopaminergic response to cocaine.
preclinical study
Gestational THC exposure led to decreased copper in the corpus callosum and altered lipid and protein composition in brain regions including the hippocampus, corpus callosum, and lateral ventricle.
experimental animal study
Lower perceived addictiveness and harm, higher social acceptability, more adverse childhood experiences, more message exposure, and higher mental health symptoms were associated with cannabis and psychedelic use and greater legalization support.
cross-sectional survey Sample size: 3227
MDMA was detected in 131 coronial cases and 193 driving cases; most cases involved co-use of other drugs, especially cannabis and alcohol.
retrospective analysis of toxicology and seizure data Sample size: 324
Chronic use of ayahuasca or cannabis was not associated with detectable lasting neuropsychological impairments in executive and working memory tasks, and personality characteristics most clearly distinguished chronic users from non-users.
cross-sectional study Sample size: 219
THC induced anxiety-like behavior, and gene expression patterns indicated a significant interaction between the adenosinergic and cannabinoidergic systems, with THC playing a predominant role in this molecular interplay.
experimental study
Smoking cannabis with 3.1% or 7.2% THC significantly reduced alcohol consumption compared to placebo, with reductions of 19% and 27%, respectively.
randomized controlled trial Sample size: 138
Neonatal THC exposure induced spatial memory deficits in female but not male rats and reduced dendritic complexity and spine density in cortical and hippocampal neurons of both sexes.
experimental study
Acute cannabis exposure prior to fear conditioning prevented spontaneous recovery of conditioned fear in both sexes, but impaired fear recall in females and had sex-specific effects on extinction.
preclinical experimental study
Low-dose oral THC (5 mg or 10 mg) prior to extinction learning affected brain indices of fear learning and memory both acutely and one week after administration in adults with PTSD.
randomized controlled trial Sample size: 36
Points of agreement
- Early-life THC exposure in rodents consistently alters neurodevelopment, motivation, and memory, with sex-specific effects.
- THC can modulate fear memory processes, with acute exposure affecting extinction and recall in both rodents and humans.
- Chronic cannabis use is not associated with lasting neuropsychological impairments in abstinent users.
- Cannabis use is associated with lower perceived harm and higher social acceptability among young adults.
Conflicts
- Some studies report cognitive deficits from early-life THC exposure, while a cross-sectional study found no lasting neuropsychological impairments in chronic adult users.
- THC's effects on anxiety are mixed: one study found THC induced anxiety-like behavior in mice, while another found no anxiety changes in rats.
- Sex-specific effects vary: some studies show female vulnerability, others show male-specific effects.
Gaps
- Most findings come from animal models, limiting direct translation to humans.
- Long-term durability of THC's effects on fear memory and alcohol consumption is not established.
- Human studies are short-term and often lack diverse populations.
- The interaction between THC dose, timing, and sex is not fully characterized.
- Few studies examine the impact of cannabis on real-world outcomes like addiction or mental health disorders.