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Cannabis

Cannabis news, research, studies, and rapid health briefings. Visit Viral Vitalism for plain-language context, evidence boundaries, and related signals.

1 published articleBuilding this topic
Consumer HealthObservationalCannabis

Does Cannabis Shrink Your Brain?

A viral claim turns cannabis brain research into a one-line shrinkage scare. The evidence is messier: blood flow, activation, volume, cognition, age, dose, and heavy-use patterns are not interchangeable.

VV Signal Score

58

Early or context-dependent

Sources
10
Studies
7
Claims
7
AHA marijuana brain healthAmen marijuana SPECT perfusionDunedin long-term cannabis
16 min readRead->

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Tier 2Clinical guidance

AHA marijuana brain health

Use of Marijuana: Effect on Brain Health

Clinical guidance from 2022 in Stroke, translated into key findings, limitations, and consumer relevance.

Stroke / 2022->

Tier 4Observational study

Amen marijuana SPECT perfusion

Discriminative Properties of Hippocampal Hypoperfusion in Marijuana Users Compared to Healthy Controls: Implications for Marijuana Administration in Alzheimer's Disease

Observational study from 2016 in Journal of Alzheimer's Disease, translated into key findings, limitations, and consumer relevance.

Journal of Alzheimer's Disease / 2016->

Tier 3Observational study

Dunedin long-term cannabis

Long-Term Cannabis Use and Cognitive Reserves and Hippocampal Volume in Midlife

Observational study from 2022 in American Journal of Psychiatry, translated into key findings, limitations, and consumer relevance.

American Journal of Psychiatry / 2022->

Tier 3Observational study

Gowin cannabis fMRI

Brain Function Outcomes of Recent and Lifetime Cannabis Use

Observational study from 2025 in JAMA Network Open, translated into key findings, limitations, and consumer relevance.

JAMA Network Open / 2025->

Tier 3Observational study

Guha cannabis aging brain

Lifetime Cannabis Use Is Associated with Brain Volume and Cognitive Function in Middle-Aged and Older Adults

Observational study from 2025 in Journal of Studies on Alcohol and Drugs, translated into key findings, limitations, and consumer relevance.

Journal of Studies on Alcohol and Drugs / 2025->

Tier 2Government safety page

NIDA cannabis brain context

What are marijuana's long-term effects on the brain?

Government safety page from 2024 in National Institute on Drug Abuse, translated into key findings, limitations, and consumer relevance.

National Institute on Drug Abuse / 2024->

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