Cannabis health warnings triggered both fear and hope in users, driving intentions to seek information and discuss harms, though adding pictures did not increase impact.
Cannabis regulators, public health communicators, and policymakers.
Hope and fear both drove protective intentions; pictures added no benefit over text
What the researchers found
Among 1,095 cannabis users, attention to warnings increased cognitive elaboration, fear, and hope. Both emotions drove protective health intentions. Pictorial warnings were no more effective than text-only.
Why it matters
Health warnings are one of few regulatory tools in legal markets. Hope, not just fear, motivates protective behavior, which could change warning design.
The numbers in context
1,095 participants. No pictorial vs text differences. Hope and fear both independently drove protective intentions.
How the study worked
Online randomized experiment with 1,095 adults (21+) in legal US states. Warnings about driving, mental health, and smoke exposure in text-only or pictorial formats. SEM analysis.
What this study cannot tell us
Online experiment, not real-world. Intentions measured, not behavior. Current users in legal states only.
How to read the evidence
Randomized experiment with adequate sample, but measures intentions not behavior.
When this study was published
Published in 2024.
The bigger picture
Cannabis warnings may not need to follow tobacco's evolution to graphic images. Hope-based messages could be equally effective.
Questions still open
- Would warnings change actual behavior?
- Could hope-based messages outperform fear-based ones?
Common questions
Do health warnings on cannabis products work?
Are picture warnings more effective?
Read the original research
Exploring the effects of cannabis health warnings on protective health intentions among US adults in legal recreational states.
The International journal on drug policy, 128, 104450
Citation
Massey, Zachary B; Li, Yachao; Zhang, Tianting; Duong, Hue Trong. (2024). Exploring the effects of cannabis health warnings on protective health intentions among US adults in legal recreational states.. The International journal on drug policy, 128, 104450. https://doi.org/10.1016/j.drugpo.2024.104450
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