High-Potency Cannabis Actually Impairs Creative Thinking | Research

The takeaway

Contrary to popular belief, high-potency cannabis (22mg THC) significantly worsened divergent thinking performance in regular users, while low-potency cannabis had no effect on creativity.

Read this if you use cannabis to boost creativity or creative work.

High-dose THC significantly worsened divergent thinking

What the researchers found

Researchers tested whether cannabis enhances creativity by giving regular users either placebo, low-dose (5.5mg THC), or high-dose (22mg THC) vaporized cannabis, then measuring their performance on creativity tasks.

Participants who received the high dose performed significantly worse on the Alternate Uses Task, a measure of divergent thinking (the ability to generate multiple creative solutions). Neither dose affected convergent thinking as measured by the Remote Associates Task.

Low-dose cannabis had no impact on either creativity measure, challenging the common belief that a small amount of cannabis boosts creative output.

Why it matters

Many cannabis users report feeling more creative when high. This study suggests that the subjective experience of enhanced creativity does not match actual creative performance, and that high-potency products may actively impair the type of thinking most associated with creativity.

The numbers in context

54 regular cannabis users in 3 groups of 18; high-dose group showed significantly worse divergent thinking; no significant effects of either dose on convergent thinking

How the study worked

Randomized, double-blind, between-groups design with 54 regular cannabis users. Three groups received placebo (n=18), low-dose 5.5mg THC (n=18), or high-dose 22mg THC (n=18) via vaporizer. Creativity measured with the Alternate Uses Task (divergent thinking) and Remote Associates Task (convergent thinking).

What this study cannot tell us

Small sample (18 per group). Between-groups design introduces individual variability. Only two creativity measures used. Lab-based creativity tasks may not capture real-world creative processes. Only tested regular users.

How to read the evidence

Well-designed RCT with validated creativity measures, but small groups and between-subjects design limit conclusions.

When this study was published

Published in 2015. Today's cannabis products are often much more potent than the 22mg THC high dose used in this study.

The bigger picture

The disconnect between feeling creative and performing creatively under cannabis influence may reflect changes in self-evaluation rather than actual cognitive enhancement. As cannabis potency increases in legal markets, these findings become more relevant.

Questions still open

Why do cannabis users feel more creative if performance actually worsens? Would CBD-dominant strains affect creativity differently? Does the impairment persist after the acute effects wear off?

Common questions

Does cannabis make you more creative?

This study found no evidence that cannabis enhances creativity. Low doses had no effect, and high doses actually impaired divergent thinking, the type of creative thinking most associated with generating novel ideas.

What is divergent thinking?

Divergent thinking is the ability to generate multiple different solutions or ideas in response to an open-ended prompt. It is considered a core component of creative ability and was measured by asking participants to list unusual uses for common objects.

Read the original research

Cannabis and creativity: highly potent cannabis impairs divergent thinking in regular cannabis users.

Psychopharmacology, 232(6), 1123-34

View on PubMed ↗Publisher’s paper ↗

Citation

Kowal, Mikael A; Hazekamp, Arno; Colzato, Lorenza S; van Steenbergen, Henk; van der Wee, Nic J A; Durieux, Jeffrey; Manai, Meriem; Hommel, Bernhard. (2015). Cannabis and creativity: highly potent cannabis impairs divergent thinking in regular cannabis users.. Psychopharmacology, 232(6), 1123-34. https://doi.org/10.1007/s00213-014-3749-1