Anti-Cannabis-Driving Messages May Accidentally Teach People How to Drive High
Health messages with detailed descriptions of cannabis-impaired driving behaviors actually increased intentions to drive high by teaching risk-reduction strategies that made people feel safer doing it.
Quick Facts
What This Study Found
Exposure to high-detail messages about cannabis-impaired driving was associated with increased DUIC intentions and behaviors, both immediately and at two-week follow-up. The effect was mediated by increased perceptions that risk-reduction behaviors would be effective (response efficacy) and confidence in performing them (self-efficacy).
Key Numbers
686 cannabis-using adult drivers. Ages 18-50. High-detail messages increased DUIC intentions vs. low-detail and control. Mediated by response efficacy and self-efficacy. Effects persisted at 2-week follow-up.
How They Did This
Online randomized experiment with 686 adult cannabis-using drivers (ages 18-50). Participants viewed messages with high vs. low detail about DUIC risk-reduction behaviors, or a control video. DUIC intentions measured immediately and at 2-week follow-up. Mediation analysis tested mechanisms.
Why This Research Matters
This is a critical warning for public health communicators: providing too much detail about how to reduce risks of cannabis-impaired driving can backfire by making people feel capable and confident about doing something dangerous. Less detail may be more effective.
The Bigger Picture
This parallels findings in other risk communication fields — detailed risk-reduction information can inadvertently normalize the risky behavior. For cannabis-impaired driving campaigns, the implication is clear: emphasize 'don't drive high' rather than 'here's how to be safer if you do.'
What This Study Doesn't Tell Us
Online experiment — intentions don't necessarily translate to behavior. Self-selected cannabis users may differ from general population. Hypothetical scenarios vs. real driving decisions. Two-week follow-up is relatively short.
Questions This Raises
- ?How should cannabis-impaired driving messages be designed?
- ?Does this backfire effect occur with alcohol messaging too?
- ?Would focusing on consequences rather than risk-reduction be more effective?
Trust & Context
- Key Stat:
- Evidence Grade:
- Randomized experiment with mediation analysis and follow-up — strong causal evidence for the messaging effect.
- Study Age:
- Published in 2026, with direct implications for ongoing cannabis public health campaign design.
- Original Title:
- The Devil is in the Details: Exploring the Impact of Risk Behavior Detail (RBD) in Health Messages Targeting Cannabis-Impaired Driving.
- Published In:
- Health communication, 1-13 (2026)
- Authors:
- Eliash-Fizik, Hadar(3), Lewis, Nehama(4), Sznitman, Sharon R(12)
- Database ID:
- RTHC-08253
Evidence Hierarchy
Frequently Asked Questions
Can anti-drug driving messages backfire?
Yes — this study found that messages with detailed information about how to reduce risks while driving after cannabis actually increased people's intentions to drive high, because the information made them feel more capable and confident about managing the risk.
What makes an effective cannabis-driving message?
This study suggests less detail is better. Messages should focus on not driving after cannabis rather than providing specific risk-reduction strategies, which can be interpreted as a how-to guide rather than a warning.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-08253APA
Eliash-Fizik, Hadar; Lewis, Nehama; Sznitman, Sharon R. (2026). The Devil is in the Details: Exploring the Impact of Risk Behavior Detail (RBD) in Health Messages Targeting Cannabis-Impaired Driving.. Health communication, 1-13. https://doi.org/10.1080/10410236.2025.2610730
MLA
Eliash-Fizik, Hadar, et al. "The Devil is in the Details: Exploring the Impact of Risk Behavior Detail (RBD) in Health Messages Targeting Cannabis-Impaired Driving.." Health communication, 2026. https://doi.org/10.1080/10410236.2025.2610730
RethinkTHC
RethinkTHC Research Database. "The Devil is in the Details: Exploring the Impact of Risk Be..." RTHC-08253. Retrieved from https://rethinkthc.com/research/eliash-fizik-2026-the-devil-is-in
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.