Habit
Frequent smoked cannabis can impair cognition, motivation, and respiratory health in some users.[1614,1782,1822, etc.]
Superscript reference numbers link to the Sources bibliography.
Composite Rating
Blends evidence depth, community direction, safety friction, and completeness.
Evidence Intensity
87/100
High depth from human/RCT/meta counts
Community Direction
0
Mixed / Neutral • confidence Minimal
Safety Friction
80/100
High signal from adverse/interaction markers
Data Completeness
100%
Studies 24 • mentions 0 • links 35
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Classification: reduce.[1065,1177,1614, etc.]
Best fit: Users with high-frequency use and cognitive/sleep complaints..[1065,1177,1614, etc.]
Goal alignment: Brain Health, Mood, Sleep, Performance.[1065,1177,1614, etc.]
Classification
Reduce
Evidence Tier
HIGH
Best Fit
Users with high-frequency use and cognitive/sleep complaints.
Primary Focus
Brain Health, Mood
Clinical Depth
Humans: 74 • RCTs: 2 • Meta: 2
Cohort / Real-World
Cohort signals: 9
Safety Markers
Adverse signals: 10 • Interactions: 0
Freshness, trend, and study timeline for this item
Status
Trend
→ Stable evidence base
Depth
74 total studies · 6 recent
Timeline
Total indexed
74
Human studies
74
Safety adverse signals
10
Cohort signals
9
Dependency signals
8
In vitro / tissue
5
Weighted direction score: 0 (Mixed / Neutral)
High when replicated human meta-analysis/trial/cohort depth is present for the habit or exposure.
Total indexed
74
Human studies
74
Safety adverse signals
10
Cohort signals
9
Dependency signals
8
In vitro / tissue
5
Neuropsych signals
4
Cardiometabolic signals
3
Randomized trials
2
Meta-analyses
2
Sleep signals
1
Distribution of evidence by study design strength
Evidence Strength: High
PMID 32119643 • 2020 Jan
Oral Health Implications of Cannabis Smoking: A Rapid Evidence Review.
Journal (Canadian Dental Association)
Open PubMedPMID 38850302 • 2024 Nov
Quantitative summary on the human pharmacokinetic properties of cannabidiol to accelerate scientific clinical application of cannabis.
Naunyn-Schmiedeberg's archives of pharmacology
Open PubMedPMID 23146820 • 2013 Jun 1
Can oral fluid cannabinoid testing monitor medication compliance and/or cannabis smoking during oral THC and oromucosal Sativex administration?
Benefit reports: 0
Adverse reports: 0
No-effect reports: 0
Mixed reports: 0
Unclear reports: 0
Signal confidence: 0.00
Benefits
Adverse
No Effect
Community confidence 0.00 with mentions: benefit 0, adverse 0, no-effect 0.
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aggregate • unclear
No directional first-hand mentions captured in the current community corpus; source links are retained for traceability.
Open mentionEvidence Sources
PUBMED • Human lifestyle/habit literature
Counts from structured habit/exposure PubMed query set.
Outcome: Humans 74, RCT 2, meta 2, cohort 9, sleep signals 1, cardiometabolic signals 3.[1614,1782,1822, etc.]
Open sourcePUBMED • 2020 • Human evidence curation set
PMID 32119643 from Journal (Canadian Dental Association).
Outcome: See linked PubMed abstract for methods and outcomes.[,, etc.]
No directional mention volume was resolved; fallback profile metadata is shown in other sections.
Animal-only studies
0
Composite of study volume, RCTs, and meta-analyses
Drug and alcohol dependence
PMID 37467370 • 2024 Jun
An intervention based on Well-Being Therapy to prevent alcohol use and other unhealthy lifestyle behaviors among students: a three-arm cluster randomized controlled trial.
Psychology, health & medicine
Open PubMedPMID 33162767 • 2020 Sep
Cannabinoids and the endocannabinoid system in reward processing and addiction: from mechanisms to interventions .
Dialogues in clinical neuroscience
Open PubMedPMID 39847355 • 2025 Jan 2
Exposure to Secondhand Cannabis Smoke Among Children.
JAMA network open
Open PubMedPMID 36716812 • 2023 May
Cannabis smoking, tobacco cigarette smoking, and adenomyosis risk.
Fertility and sterility
Open PubMedPMID 34674905 • 2022 Feb
In-home cannabis smoking more prevalent than in-home tobacco smoking among 2019 Global Drug Survey respondents.
Addictive behaviors
Open PubMedPMID 17712818 • 2007 Aug
The toxicology of cannabis and cannabis prohibition.
Chemistry & biodiversity
Open PubMedPMID 25012035 • 2014 Jun
[Cannabis smoking and lung cancer].
Revue des maladies respiratoires
Open PubMedPMID 39547285 • 2024 Dec
Clearing the air: Heightened perception of harm from secondhand cannabis smoke exposure is associated with no in-home cannabis smoking in a 21-country convenience sample.
Preventive medicine
Open PubMedPMID 36645714 • 2023 Mar
Early-onset smoking and vaping of cannabis: Prevalence, correlates and trends in New Zealand 14-15-year-olds.
Drug and alcohol review
Open PubMedPMID 37199428 • 2023 Oct 1
Variable Delta-9-Tetrahydrocannabinol Pharmacokinetics and Pharmacodynamics After Cannabis Smoking in Regular Users.
Therapeutic drug monitoring
Open PubMedPMID 33929931 • 2021 Apr 1
Periodontal status in cannabis smokers. A systematic review.
Journal of the International Academy of Periodontology
Open PubMedPMID 40249613 • 2025 Apr 1
Legalizing Youth-Friendly Cannabis Edibles and Extracts and Adolescent Cannabis Use.
JAMA network open
Open PubMedPMID 34448130 • 2022 Apr
Are vaporizers a lower-risk alternative to smoking cannabis?
Canadian journal of public health = Revue canadienne de sante publique
Open PubMedPMID 33467405 • 2021 Jan 15
Association between Friends' Use of Nicotine and Cannabis and Intake of both Substances among Adolescents.
International journal of environmental research and public health
Open PubMedPMID 34850898 • 2021 Nov 28
Nonmedical Cannabis Use: Patterns and Correlates of Use, Exposure, and Harm, and Cancer Risk.
Journal of the National Cancer Institute. Monographs
Open PubMedPMID 37157001 • 2023 Jul
Cannabis self-administration in the human laboratory: a scoping review of ad libitum studies.
Psychopharmacology
Open PubMedPMID 41198398 • 2026 Jan
Clinical, physiological, imaging and molecular responses to cannabis smoking: the Canadian Users of Cannabis Smoke (CANUCK) study.
The European respiratory journal
Open PubMedPMID 31433338 • 2019 Sep/Oct
The Potential for Pharmacokinetic Interactions Between Cannabis Products and Conventional Medications.
Journal of clinical psychopharmacology
Open PubMedPMID 18252882 • 2008 Feb 6
Cannabis smoking and periodontal disease among young adults.
JAMA
Open PubMedPMID 24947688 • 2015 Feb 15
Cannabis smoking and lung cancer risk: Pooled analysis in the International Lung Cancer Consortium.
International journal of cancer
Open PubMedPMID 15516313 • 2004 Oct
Passive cannabis smoke exposure and oral fluid testing.
Journal of analytical toxicology
Open PubMedFallback search fetch failed: Failed to fetch after retries: https://old.reddit.com/search.json?raw_json=1&sort=relevance&t=year&limit=12&q=cannabis%20smoking
Community Sources
PUBMED • 2024 • Human evidence curation set
PMID 38850302 from Naunyn-Schmiedeberg's archives of pharmacology.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2024 • Human evidence curation set
PMID 37467370 from Psychology, health & medicine.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2013 • Human evidence curation set
PMID 23146820 from Drug and alcohol dependence.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2020 • Human evidence curation set
PMID 33162767 from Dialogues in clinical neuroscience.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2025 • Human evidence curation set
PMID 39847355 from JAMA network open.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2023 • Human evidence curation set
PMID 36716812 from Fertility and sterility.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2022 • Human evidence curation set
PMID 34674905 from Addictive behaviors.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2007 • Human evidence curation set
PMID 17712818 from Chemistry & biodiversity.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2014 • Human evidence curation set
PMID 25012035 from Revue des maladies respiratoires.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2024 • Human evidence curation set
PMID 39547285 from Preventive medicine.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2023 • Human evidence curation set
PMID 36645714 from Drug and alcohol review.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2023 • Human evidence curation set
PMID 37199428 from Therapeutic drug monitoring.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2021 • Human evidence curation set
PMID 33929931 from Journal of the International Academy of Periodontology.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2025 • Human evidence curation set
PMID 40249613 from JAMA network open.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2022 • Human evidence curation set
PMID 34448130 from Canadian journal of public health = Revue canadienne de sante publique.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2021 • Human evidence curation set
PMID 33467405 from International journal of environmental research and public health.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2021 • Human evidence curation set
PMID 34850898 from Journal of the National Cancer Institute. Monographs.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2023 • Human evidence curation set
PMID 37157001 from Psychopharmacology.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2026 • Human evidence curation set
PMID 41198398 from The European respiratory journal.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2019 • Human evidence curation set
PMID 31433338 from Journal of clinical psychopharmacology.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2008 • Human evidence curation set
PMID 18252882 from JAMA.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2015 • Human evidence curation set
PMID 24947688 from International journal of cancer.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open sourcePUBMED • 2004 • Human evidence curation set
PMID 15516313 from Journal of analytical toxicology.
Outcome: See linked PubMed abstract for methods and outcomes.[1614,1782,1822, etc.]
Open source