ArticleNeuropsychology2015
Tobacco may mask poorer episodic memory among young adult cannabis users.
Article in Neuropsychology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 1 of them a synthesis 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
24 citing papers in PubMed, 1 synthesis or guideline pooled it.
- The Influence of Cannabis and Nicotine Co-use on Neuromaturation: A Systematic Review of Adolescent and Young Adult Studies.Biological psychiatry · 2021Pooled it
- Acute memory and psychotomimetic effects of cannabis and tobacco both 'joint' and individually: a placebo-controlled trial.Psychological medicine · 2017Trial
- Effects of Inhaled Tobacco and Cannabis Co-Use on Respiratory Health and Tobacco Cessation: An Official American Thoracic Society Research Statement.American journal of respiratory and critical care medicine · 2025Article
- The Combined Effects of Nicotine and Cannabis on Cortical Thickness Estimates in Adolescents and Emerging Adults.Brain sciences · 2024Article
- Effect of Cannabis on Memory Consolidation, Learning and Retrieval and Its Current Legal Status in India: A Review.Biomolecules · 2023Review
- E-cigarettes may serve as a gateway to conventional cigarettes and other addictive drugs.Advances in drug and alcohol research · 2023Review
- How do cannabis users mentally travel in time? Evidence from an fMRI study of episodic future thinking.Psychopharmacology · 2022Article
- Preliminary Evidence for Cannabis and Nicotine Urinary Metabolites as Predictors of Verbal Memory Performance and Learning Among Young Adults.Journal of the International Neuropsychological Society : JINS · 2021Article
- Initiation of Moderately Frequent Cannabis use in Adolescence and Young Adulthood is Associated with Declines in Verbal Learning and Memory: A Longitudinal Comparison of Pre- versus Post-Initiation Cognitive Performance.Journal of the International Neuropsychological Society : JINS · 2021Article
- Independent and Combined Effects of Nicotine or Chronic Tobacco Smoking and HIV on the Brain: A Review of Preclinical and Clinical Studies.Journal of neuroimmune pharmacology : the official journal of the Society on NeuroImmune Pharmacology · 2020Review
- Cigarette smoking quit ratios among adults in the USA with cannabis use and cannabis use disorders, 2002-2016.Tobacco control · 2020Article
- Marijuana use associated with worse verbal learning and delayed recall in a sample of young adults.Revista medica de Chile · 2019Article
- Transition to drug co-use among adolescent cannabis users: The role of decision-making and mental health.Addictive behaviors · 2018Article
- Trends in cannabis use disorder by cigarette smoking status in the United States, 2002-2016.Drug and alcohol dependence · 2018Article
- Differential associations of combined vs. isolated cannabis and nicotine on brain resting state networks.Brain structure & function · 2018Article
- Trends in Daily Cannabis Use Among Cigarette Smokers: United States, 2002-2014.American journal of public health · 2018Article
- Marijuana effects on changes in brain structure and cognitive function among HIV+ and HIV- adults.Drug and alcohol dependence · 2017Article
- Ecological momentary assessment of working memory under conditions of simultaneous marijuana and tobacco use.Addiction (Abingdon, England) · 2016Article
- Comorbid Cannabis and Tobacco Use in Adolescents and Adults.Current addiction reports · 2016Article
- Early onset marijuana use is associated with learning inefficiencies.Neuropsychology · 2016Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
Abstract
objectiveCo-occurring cannabis and tobacco use has become increasingly prevalent among young adults, but it is not clear how tobacco use may alter the neurocognitive profile typically observed among cannabis users. Although there is substantial evidence citing cannabis and tobacco's individual effect on episodic memory and related brain structures, few studies have examined the effect of combined cannabis and tobacco use on memory.
methodThis investigation examined relationships between amount of past year cannabis and tobacco use on 4 different indices of episodic memory among a sample of young adults who identified cannabis as their drug of choice.
resultsResults indicated that more cannabis use was linked with poorer initial acquisition, total learning, and delayed recall on the Hopkins Verbal Learning Test-Revised, but only among cannabis users who sporadically smoked cigarettes in the past year. Conversely, the amount of past year cannabis use was not associated with episodic memory performance among individuals who more consistently smoked cigarettes in the past year. These differences could not be explained by several relevant potential confounds.
conclusionsThese findings provide important insight into a potential mechanism (i.e., attenuation of cognitive decrements) that might reinforce use of both substances and hamper cessation attempts among cannabis users who also smoke cigarettes. Ongoing and future research will help to better understand how co-use of cannabis and tobacco affects memory during acute intoxication and abstinence and the stability of these associations over time.
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.