ArticleJAMA network open2024
Cannabis and Driving in Older Adults.
Article in JAMA network open, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 2 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
13 citing papers in PubMed, 2 syntheses or guidelines pooled it, 23 citations in OpenAlex.
- Association of driving with blood delta-9-tetrahydrocannabinol: a systematic review.The international journal of neuropsychopharmacology · 2025Pooled it
- Does Cannabis Use Contribute to Schizophrenia? A Causation Analysis Based on Epidemiological Evidence.Biomolecules · 2025Pooled it
- Potency-related effects of smoked cannabis on simulated driving performance: a randomized, controlled crossover trial.Scientific reports · 2026Trial
- Cannabis for sleep in older adults: use has outpaced the science.Journal of cannabis research · 2026Article
- Retrospective Event-Level Patterns of Cannabis-Impaired Driving.Journal of studies on alcohol and drugs · 2026Article
- The use of THC cutoff levels in blood and oral fluid for detecting impairment in frequent cannabis users who smoked cannabis the "evening before".Psychopharmacology · 2026Article
- Cognitive performance and subjective effects the morning after last use of smoked cannabis by adults who use cannabis frequently: An observational study.Drug and alcohol dependence reports · 2026Article
- Age-Related Effects of Cannabis and Cannabinoids on Brain and Behavior.Cannabis and cannabinoid research · 2026Review
- Driving by frequent cannabis users 'the morning after' last use of smoked cannabis: an observational driving simulator study.Journal of cannabis research · 2026Article
- The theory of planned behavior partly explains why adults with chronic musculoskeletal pain consider using medical cannabis for pain management.Scientific reports · 2026Article
- Review
- [Reduced mobility in the elderly due to medication, alcohol, and cannabinoids].Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz · 2024Review
- Neuromodulation for Cannabis Use: A Scoping Review.Brain sciences · 2024Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
15 authors at 4 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Importance: Epidemiological studies have found that cannabis increases the risk of a motor vehicle collision. Cannabis use is increasing in older adults, but laboratory studies of the association between cannabis and driving in people aged older than 65 years are lacking. Objective: To investigate the association between cannabis, simulated driving, and concurrent blood tetrahydrocannabinol (THC) levels in older adults. Design, Setting, and Participants: Using an ecologically valid counterbalanced design, in this cohort study, regular cannabis users operated a driving simulator before, 30 minutes after, and 180 minutes after smoking their preferred legal cannabis or after resting. This study was conducted in Toronto, Canada, between March and November 2022 with no follow-up period. Data were analyzed from December 2022 to February 2023. Exposures: Most participants chose THC-dominant cannabis with a mean (SD) content of 18.74% (6.12%) THC and 1.46% (3.37%) cannabidiol (CBD). Main outcomes and measures: The primary end point was SD of lateral position (SDLP, or weaving). Secondary outcomes were mean speed (MS), maximum speed, SD of speed, and reaction time. Driving was assessed under both single-task and dual-task (distracted) conditions. Blood THC and metabolites of THC and CBD were also measured at the time of the drives. Results: A total of 31 participants (21 male [68%]; 29 White [94%], 1 Latin American [3%], and 1 mixed race [3%]; mean [SD] age, 68.7 [3.5] years), completed all study procedures. SDLP was increased and MS was decreased at 30 but not 180 minutes after smoking cannabis compared with the control condition in both the single-task (SDLP effect size [ES], 0.30; b = 1.65; 95% CI, 0.37 to 2.93; MS ES, -0.58; b = -2.46; 95% CI, -3.56 to -1.36) and dual-task (SDLP ES, 0.27; b = 1.75; 95% CI, 0.21 to 3.28; MS ES, -0.47; b = -3.15; 95% CI, -5.05 to -1.24) conditions. Blood THC levels were significantly increased at 30 minutes but not 180 minutes. Blood THC was not correlated with SDLP or MS at 30 minutes, and SDLP was not correlated with MS. Subjective ratings remained elevated for 5 hours and participants reported that they were less willing to drive at 3 hours after smoking. Conclusions and relevance: In this cohort study, the findings suggested that older drivers should exercise caution after smoking cannabis.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.