Are blood and oral fluid Δ9-tetrahydrocannabinol (THC) and metabolite concentrations related to impairment? A meta-regression analysis

Blood and oral fluid Δ9-tetrahydrocannabinol (THC) concentrations are often used to identify cannabis-impaired drivers. We used meta-analytic techniques to characterise the relationships between biomarkers of cannabis use, subjective intoxication, and impairment of driving and driving-related cognitive skills.

Update and perspectives on minor plant-derived cannabinoids of biomedical interest

Recently, the first publically-funded Latin American cannabinoid research network (CannaLatan,, formed by academic investigators and pharma companies of different countries, was launched. CannaLatan aims to promote and boost the results obtained by the different partners of the consortium developing collaborative research and educational projects. The CannaLatan network is devoted to tackle the potential therapeutic applications of under-investigated phytocannabinoids and novel cannabinoid-based molecules, as well to clarify their undesired actions. Here we discuss one of the ongoing projects initiated by CannaLatan with the financial support of Fundación Canna ( , in which we address the anti-psychotic and cognitive actions of acidic forms of phytocannabinoids, namely THCa

Daily Cannabis Use is Associated With Lower CNS Inflammation in People With HIV

Recent cannabis exposure has been associated with lower rates of neurocognitive impairment in people with HIV (PWH). Cannabis’s anti-inflammatory properties may underlie this relationship by reducing chronic neuroinflammation in PWH. This study examined relations between cannabis use and inflammatory biomarkers in cerebrospinal fluid (CSF) and plasma, and cognitive correlates of these biomarkers within a community-based sample of PWH.

An Observational, Longitudinal Study of Cognition in Medical Cannabis Patients over the Course of 12 Months of Treatment: Preliminary Results

Cannabis use has increased dramatically across the country; however, few studies have assessed the long-term impact of medical cannabis (MC) use on cognition. Studies examining recreational cannabis users generally report cognitive decrements, particularly in those with adolescent onset. As MC patients differ from recreational consumers in motives for use, product selection, and age of onset, we assessed cognitive and clinical measures in well-characterized MC patients over 1 year. Based on previous findings, we hypothesized MC patients would not show decrements and might instead demonstrate improvements in executive function over time.

Medical cannabis and cognitive performance in middle to old adults treated for chronic pain

Authors: Sharon R Sznitman, Simon Vulfsons, David Meiri, Galit Weinstein Published in Drug and Alcohol Review September 2020 Abstract Introduction and aims: Cannabis exposure is becoming more common in older age but little is known about how it is associated with brain health in this population. This study assesses the relationship between long-term medical cannabis…

Acute effects of naturalistic THC vs. CBD use on recognition memory: a preliminary study

Authors: Tim Curran , Hélène Devillez , Sophie L. York Williams and L. Cinnamon Bidwell Published in Journal of Cannabis Research  2020 Abstract The ratio of Δ9-tetrahydrocannabinol (THC) to cannabidiol (CBD) varies widely across cannabis strains. CBD has opposite effects to THC on a variety of cognitive functions, including acute THC-induced memory impairments. However, additional…

Totality of the Evidence Suggests Prenatal Cannabis Exposure Does Not Lead to Cognitive Impairments: A Systematic and Critical Review

Author: Ciara A. Torres, Christopher Medina-Kirchner, Kate Y. O’Malley, and Carl L. Hart Published in Frontiers in Psychology May 2020 Abstract Background Despite limited data demonstrating pronounced negative effects of prenatal cannabis exposure, popular opinion and public policies still reflect the belief that cannabis is fetotoxic. Methods This article provides a critical review of results from…

Acute and residual mood and cognitive performance of young adults following smoked cannabis

Authors: Justin Matheson, Robert E. Mann, Beth Sproule, Marilyn A. Huestis, Christine M. Wickens, Gina Stoduto, Tony P. George, Jürgen Rehm, Bernard Le Foll, Bruna Brands Published in Science Direct  July 2020 Abstract Objectives To examine acute and residual mood and cognitive performance in young adult regular cannabis users following smoked cannabis. Methods Ninety-one healthy…

Cannabis use during pregnancy: Pharmacokinetics and effects on child development.

Authors: Kimberly S.Grant, Rebekah Petroff, Nina Isoherranen, Nephi Stella, Thomas M. Burbacher
Pharmacology & Therapeutics, February 2018

The broad-based legalization of cannabis use has created a strong need to understand its impact on human health and behavior. The risks that may be associated with cannabis use, particularly for sensitive subgroups such as pregnant women, are difficult to define because of a p…

Efficacy of Inhaled Cannabis on Painful Diabetic Neuropathy.

Authors: Mark S. Wallace, Thomas D. Marcotte, Anya Umlauf, Ben Gouaux, Joseph H. Atkinson
The Journal of Pain, July 2015

A randomized, double-blinded, placebo controlled crossover study was conducted in 16 patients with painful diabetic peripheral neuropathy to assess the short-term efficacy and tolerability of inhaled cannabis. In a crossover design, each participant was exposed to 4 single dos…

Smoked cannabis for spasticity in multiple sclerosis: a randomized, placebo-controlled trial.

Authors: Jody Corey-Bloom, Tanya Wolfson, Anthony Gamst, Shelia Jin, Thomas D. Marcotte, et al
CMAJ, 10 July 2012

BACKGROUND: Spasticity is a common and poorly controlled symptom of multiple sclerosis. Our objective was to determine the short-term effect of smoked cannabis on this symptom. METHODS: We conducted a placebo-controlled, crossover trial involving adult patients with multiple s…

Effects of Δ9-tetrahydrocannabinol administration on human encoding and recall memory function: a pharmacological FMRI study.

Authors: Matthijs G. Bossong, Gerry Jager, Hendrika H. van Hell, Lineke Zuurman, et al
Journal of Cognitive Neuroscience, March 2012

Deficits in memory function are an incapacitating aspect of various psychiatric and neurological disorders. Animal studies have recently provided strong evidence for involvement of the endocannabinoid (eCB) system in memory function. Neuropsychological studies in humans have s…