INDEPENDENT EVIDENCE DESK · BETA

Claims, graded — not hyped

A citation-first database for cannabis claims. We show what the evidence supports, where it conflicts, and what remains unknown.

EVIDENCE SCALE / 01

  1. SupportedConvergent, relevant evidence
  2. MixedCredible evidence disagrees
  3. UnsupportedClaim exceeds or conflicts with evidence
  4. UnverifiedToo little reliable evidence

CLAIM INDEX / 6 RECORDS

Start with the claim. Follow the evidence.

How grades work →
SUPPORTEDFC-001 · reviewed 2026-07-12

Cannabis can impair skills used for safe driving.

THC can affect reaction time, coordination, perception, and judgment. Risk depends on dose, timing, individual response, and co-use of alcohol or other substances.

ConfidenceHigh
Primary source: CDC →
UNSUPPORTEDFC-002 · reviewed 2026-07-12

“Cannabis smoke is harmless to the lungs.”

Smoke from cannabis contains many of the same toxins and irritants as tobacco smoke. Evidence does not support calling inhaled smoke harmless.

ConfidenceHigh
Primary source: CDC →
UNSUPPORTEDFC-003 · reviewed 2026-07-12

“Cannabis cures cancer.”

Cannabinoids may help some treatment-related symptoms, but that is not evidence that cannabis cures cancer. Laboratory findings do not establish a human cancer cure.

ConfidenceHigh
Primary source: NCI →
MIXEDFC-004 · reviewed 2026-07-12

“CBD is proven to treat epilepsy.”

A purified CBD medicine is FDA-approved for seizures associated with specific conditions. That does not validate every CBD product, dose, or epilepsy claim.

ConfidenceHigh on the narrow indication
Primary source: FDA →
UNSUPPORTEDFC-005 · reviewed 2026-07-12

“Cannabis use carries no dependence risk.”

Some people develop cannabis use disorder. Estimates vary by definition, population, frequency, potency, and age of initiation, so a single universal percentage can mislead.

ConfidenceHigh
Primary source: CDC →
UNVERIFIEDFC-006 · reviewed 2026-07-12

“Cannabis permanently lowers IQ in every user.”

Research associates early, frequent use with cognitive concerns, but “every user” and a fixed permanent effect overstate what observational evidence can establish.

ConfidenceModerate
Evidence synthesis: National Academies →

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