School-based neuroscience program reduced substance use among older teens
A neuroscience-based harm reduction program for 16- to 19-year-olds reduced binge drinking, cannabis use, MDMA use, nicotine use, and alcohol-related harms at 6-month follow-up.
Quick Facts
What This Study Found
Students who received the Illicit Project program were significantly less likely than controls to engage in weekly binge drinking (OR 0.56), early cannabis use (OR 0.35), risky cannabis use (OR 0.48), MDMA use (OR 0.16), and nicotine use (OR 0.59). They also had fewer alcohol-related harms and higher drug literacy.
Key Numbers
950 students, 60% female, mean age 15.9. Cannabis early onset odds reduced by 65% (OR 0.35). MDMA use odds reduced by 84% (OR 0.16). Drug literacy scores increased by 2.44 points.
How They Did This
Cluster randomized controlled trial with 950 students (mean age 15.9) from 8 Australian secondary schools. Five schools received the intervention, three received standard health education. Self-report surveys at baseline and 6 months.
Why This Research Matters
Few evidence-based substance use prevention programs target older adolescents (16-19), the age when substance use typically escalates.
The Bigger Picture
The program uses neuroscience-based education rather than abstinence messaging, aligning with harm reduction approaches that may resonate better with older adolescents.
What This Study Doesn't Tell Us
Only 6-month follow-up; durability unknown. Self-reported outcomes. Unequal cluster sizes (5 intervention vs 3 control schools). Australian context may limit generalizability.
Questions This Raises
- ?Do the reductions in substance use persist beyond 6 months?
- ?Would the program work in non-Australian school systems?
Trust & Context
- Key Stat:
- 65% reduction in early cannabis use onset (OR 0.35)
- Evidence Grade:
- Randomized controlled trial with a reasonable sample size, though limited by short follow-up and self-reported outcomes.
- Study Age:
- Published in 2022.
- Original Title:
- Effectiveness of a neuroscience-based, harm reduction program for older adolescents: A cluster randomised controlled trial of the Illicit Project.
- Published In:
- Preventive medicine reports, 26, 101706 (2022)
- Authors:
- Debenham, Jennifer(5), Champion, Katrina(2), Birrell, Louise(4), Newton, Nicola
- Database ID:
- RTHC-03796
Evidence Hierarchy
Participants are randomly assigned to treatment or placebo groups to test cause and effect.
What do these levels mean? →Frequently Asked Questions
What made this program different from typical drug education?
The Illicit Project uses neuroscience-based, harm reduction messaging rather than abstinence-only approaches, specifically targeting older adolescents (16-19) who are often overlooked by prevention programs.
Which substance showed the largest reduction?
MDMA use showed the largest reduction, with intervention students 84% less likely to use it compared to controls (OR 0.16).
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Cite This Study
https://rethinkthc.com/research/RTHC-03796APA
Debenham, Jennifer; Champion, Katrina; Birrell, Louise; Newton, Nicola. (2022). Effectiveness of a neuroscience-based, harm reduction program for older adolescents: A cluster randomised controlled trial of the Illicit Project.. Preventive medicine reports, 26, 101706. https://doi.org/10.1016/j.pmedr.2022.101706
MLA
Debenham, Jennifer, et al. "Effectiveness of a neuroscience-based, harm reduction program for older adolescents: A cluster randomised controlled trial of the Illicit Project.." Preventive medicine reports, 2022. https://doi.org/10.1016/j.pmedr.2022.101706
RethinkTHC
RethinkTHC Research Database. "Effectiveness of a neuroscience-based, harm reduction progra..." RTHC-03796. Retrieved from https://rethinkthc.com/research/debenham-2022-effectiveness-of-a-neurosciencebased
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.