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Preliminary efficacy of 'high-alert' a brief smartphone intervention to reduce Cannabis-impaired driving among youth: A pilot randomized controlled trial
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DOI：10.1016/j.trf.2025.103489.png)
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Abstract
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Introduction: Driving under the influence of cannabis (DUIC) is a growing public health concern, particularly among young drivers. This pilot study explores the short-term preliminary efficacy of High Alert, a brief smartphone intervention designed to reduce DUIC among youth. Methods: An online pilot randomized controlled trial was conducted with 102 youth aged 18-24 who had a history of DUIC (>= 3 times in the past 3 months). Participants were randomized into three groups: High Alert (n = 37), Active Control (n = 34), or Passive Control (n = 31). High Alert included two web-based sessions on cannabis and DUIC education. The Active Control received a single session reviewing six DUIC-related infographics, while the Passive Control received no intervention. The primary outcome was self-reported DUIC incidents (alone or with other substances) over 3 months, assessed at baseline and 3-month follow-up. Results: Among the 52 participants who completed the 3-month follow-up (High Alert: n = 16; Active Control: n = 16; Passive Control: n = 20), High Alert showed the greatest mean reduction in DUIC incidents (-7.44, Cohen's d =-0.40), compared to Active Control (-3.62, d =-0.49) and Passive Control (-3.05, d =-0.38). The reduction was statistically significant compared to Passive Control ((3 =-0.61, p = .03), but not Active Control ((3 =-0.08, p = .781). Conclusions: Preliminary findings suggest that High Alert may show promise in reducing self-reported DUIC behaviours compared to a no-contact control group, but additional research with larger samples and longer follow-ups is needed. ClinicalTrials.gov registration: NCT06098573.
Keywords:
Impaired driving
Cannabis
Driving under the influence of cannabis
Youth
Smartphone intervention
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