CBD Did Not Block THC's Effect on Attentional Bias Toward Cannabis Cues | Research

The takeaway

In a crossover trial with 46 users, THC increased attentional bias toward cannabis cues and CBD at three doses did not reduce this effect.

Consumers, harm reduction advocates, and CBD-THC researchers.

CBD had no effect on THC-induced attentional bias at any dose

What the researchers found

THC (10 mg) increased attentional bias (d=0.41, P=0.03). CBD at 10, 20, or 30 mg had no effect at any dose.

Why it matters

Challenges the notion that CBD cancels out THC's harmful properties for this addiction-relevant marker.

The numbers in context

46 participants; 4 sessions; THC 10 mg; CBD 0/10/20/30 mg; bias increase d=0.41; no CBD effect

How the study worked

Double-blind, randomized, within-subjects crossover with 46 infrequent users across four sessions.

What this study cannot tell us

Infrequent users only. Proxy measure. Single acute exposure. One THC dose.

How to read the evidence

Well-designed crossover trial with multiple CBD doses.

When this study was published

Published in 2024.

The bigger picture

At ratios found in commercial cannabis, CBD did not protect against this addiction-relevant THC effect.

Questions still open

Does CBD counteract other THC effects?
Would higher CBD ratios help?

Common questions

Does CBD cancel THC's effects?

Not for attentional bias, an addiction-relevant marker.

What is attentional bias?

Automatically paying more attention to drug-related cues, a marker of addiction vulnerability.

Read the original research

Cannabidiol does not attenuate acute delta-9-tetrahydrocannabinol-induced attentional bias in healthy volunteers: A randomised, double-blind, cross-over study.

Addiction (Abingdon, England), 119(2), 322-333

View on PubMed ↗Publisher’s paper ↗

Citation

Oliver, Dominic; Englund, Amir; Chesney, Edward; Chester, Lucy; Wilson, Jack; Sovi, Simina; Wigroth, Stina; Hodsoll, John; Strang, John; Murray, Robin M; Freeman, Tom P; Fusar-Poli, Paolo; McGuire, Philip. (2024). Cannabidiol does not attenuate acute delta-9-tetrahydrocannabinol-induced attentional bias in healthy volunteers: A randomised, double-blind, cross-over study.. Addiction (Abingdon, England), 119(2), 322-333. https://doi.org/10.1111/add.16353