March 2026
Cannabis
What March 2026's 7 new studies found, synthesized from the papers below. All Cannabis research →
The synthesis
Synthesized from 7 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 March 2026, research on cannabis reported that acute cannabis use impairs memory and driving performance in a potency-dependent manner, while effects on cognition and driving in frequent users were more nuanced. The evidence is consistent in showing acute impairment, but the durability of these effects and their translation to real-world settings remain unclear.
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 |
|---|---|---|---|---|
| Gabriella Gobbi: Embracing psychiatry from bench to bedside 2026 | interview | Supports | This interview summarizes prior research showing that adolescent cannabis exposure increases vulnerability to depression, but no new March 2026 findings are reported. | |
| Potency-related effects of smoked cannabis on simulated driving performance: a randomized, controlled crossover trial. 2026 | randomized controlled trial | Supports | Smoked cannabis with medium or high THC increased maximum speed and reaction time, and all potencies increased SDLP, indicating potency-dependent impairment in simulated driving. | |
| Acute cannabidiol (CBD), tetrahydrocannabinol (THC) and their mixture (THC:CBD) exert differential effects on brain activity and blood flow in rats: A translational neuroimaging study. 2026 | randomized controlled trial | Supports | THC increased brain functional connectivity and cerebral blood flow in rats, while CBD decreased connectivity without affecting blood flow, and CBD moderated THC's effects when combined. | |
| Effects of naturalistic doses of cannabis edibles on cognition and association with blood THC. 2026 | observational study | 22 | Mixed | At 150 minutes after ingesting a cannabis edible, performance decreased on two measures of verbal free recall, but no effects were found on visual attention or executive function, and blood THC was not correlated with any cognitive outcomes. |
| The effects of orally ingested Delta-9-Tetrahydrocannabinol on drivers' hazard perception and risk-taking behaviours: A within-subjects study of medicinal cannabis users. 2026 | within-subjects design | 41 | Mixed | Orally ingested THC did not impair actual hazard perception skill in medicinal cannabis users, but they drove slower and followed at longer distances after consumption. |
| Working memory capacity predicts cannabis-induced effects on alcohol urge. 2026 | randomized placebo-controlled crossover trial | 125 | Supports | Individuals with higher working memory capacity reported significantly lower alcohol urge after smoking 7.2% THC cannabis relative to placebo, while those with lower working memory did not show this effect. |
| Mapping the acute effects of cannabis on multiple memory domains: A randomized, double-blind, placebo-controlled study. 2026 | randomized controlled trial | 120 | Supports | Acute cannabis use broadly impairs most domains of memory, including prospective and temporal order memory, with no significant difference between moderate and high doses. |
This interview summarizes prior research showing that adolescent cannabis exposure increases vulnerability to depression, but no new March 2026 findings are reported.
interview
Smoked cannabis with medium or high THC increased maximum speed and reaction time, and all potencies increased SDLP, indicating potency-dependent impairment in simulated driving.
randomized controlled trial
THC increased brain functional connectivity and cerebral blood flow in rats, while CBD decreased connectivity without affecting blood flow, and CBD moderated THC's effects when combined.
randomized controlled trial
At 150 minutes after ingesting a cannabis edible, performance decreased on two measures of verbal free recall, but no effects were found on visual attention or executive function, and blood THC was not correlated with any cognitive outcomes.
observational study Sample size: 22
Orally ingested THC did not impair actual hazard perception skill in medicinal cannabis users, but they drove slower and followed at longer distances after consumption.
within-subjects design Sample size: 41
Individuals with higher working memory capacity reported significantly lower alcohol urge after smoking 7.2% THC cannabis relative to placebo, while those with lower working memory did not show this effect.
randomized placebo-controlled crossover trial Sample size: 125
Acute cannabis use broadly impairs most domains of memory, including prospective and temporal order memory, with no significant difference between moderate and high doses.
randomized controlled trial Sample size: 120
Points of agreement
- Acute cannabis use impairs memory and driving performance.
- Higher THC potency leads to greater impairment in driving and memory.
- Cannabis affects brain connectivity and blood flow in animal models.
Conflicts
- One study found no impairment in hazard perception in medicinal users, while another found driving impairment in regular users.
- Blood THC levels correlated with driving impairment in one study but not with cognitive outcomes in another.
Gaps
- Durability of effects beyond acute phase is not addressed.
- Long-term effects of cannabis on depression vulnerability are not directly studied in March 2026.
- Real-world driving performance is not directly measured; studies use simulated tasks.
- Effects in diverse populations (e.g., occasional users, older adults) are not covered.
- Dose-response relationships for edibles and oral THC are not fully characterized.