Self-directed intervention for problematic cannabis use

Promoting self-change in problematic cannabis use: a randomized clinical trial of a brief self-directed cognitive-behavioural and motivational intervention

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN42632893

Enrollment

120

Registered

2022-07-28

Start date

2020-12-03

Completion date

Unknown

Last updated

2023-01-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Problematic cannabis use in adults Mental and Behavioural Disorders

Interventions

Participants are randomly allocated to either (a) receive a self-directed treatment workbook

(b) receive the treatment workbook in combination with a brief motivational telephone interaction

or (3) a waitlist control group. The blockrand package (Snow, 2020) in R version 4.0.3 (R Core Team, 2020) is used to create stratified random assignments within randomly chosen block sizes of 3, 6, 9

development of discrepancies between the individual’s current behaviour and their goals or values

avoidance of argumentation

roll with resistance

and support the individual’s self-efficacy. The participant s cannabis use (days of cannabis use, quantity of cannabis) will be tracked for a 12-month follow-up peri

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. 18 years of age or older 2. Fluent in English 3. Perception of a cannabis use problem 4. A score of 13 or greater on the Cannabis Use Disorders Identification Test-Revised (CUDIT-R; Adamson et al., 2010) 5. Have used cannabis at least once in the past month 6. Not currently receiving any other treatment for cannabis use problems (including 12-step programs and any medical or psychological treatment where cannabis problems are addressed)

Exclusion criteria

Exclusion criteria: Currently involved in treatment (including 12-step programs and any medical or psychological treatment where cannabis problems are addressed)

Design outcomes

Primary

Measure	Time frame
1. Frequency of cannabis use in the previous month, measured using the Cannabis Engagement Assessment (CEA), a self-report questionnaire of recent cannabis engagement that asks participants to report the days of cannabis use in the previous 30 days, measured at initial assessment and follow-up (3, 6, 12 months). 2. Quantity of cannabis use used in the previous month, measured using the CEA, which includes questions on the quantity of cannabis use across three modes of cannabis (dry leaf, concentrates, edibles), measured at initial assessment and follow-up (3, 6, 12 months)	—

Measure

Time frame

1. Frequency of cannabis use in the previous month, measured using the Cannabis Engagement Assessment (CEA), a self-report questionnaire of recent cannabis engagement that asks participants to report the days of cannabis use in the previous 30 days, measured at initial assessment and follow-up (3, 6, 12 months). 2. Quantity of cannabis use used in the previous month, measured using the CEA, which includes questions on the quantity of cannabis use across three modes of cannabis (dry leaf, concentrates, edibles), measured at initial assessment and follow-up (3, 6, 12 months)

—

Secondary

Measure	Time frame
1. Cannabis use-related problems, measured by the Marijuana Problem Scale at initial assessment and follow-up (3, 6, 12 months) 2. Psychological distress, measured by the Kessler Psychological Distress Scale (K10) at initial assessment and follow-up (3, 6, 12 months) 3. Quality of life, measured by the World Health Organization Quality of Life – 8 Item Scale at initial assessment and follow-up (3, 6, 12 months) 3. Self-rated improvement measured on a Likert scale of 0 - “nothing has changed” to 10 - “I reached my goal”at follow-up (3, 6, 12 months)	—

Measure

Time frame

1. Cannabis use-related problems, measured by the Marijuana Problem Scale at initial assessment and follow-up (3, 6, 12 months) 2. Psychological distress, measured by the Kessler Psychological Distress Scale (K10) at initial assessment and follow-up (3, 6, 12 months) 3. Quality of life, measured by the World Health Organization Quality of Life – 8 Item Scale at initial assessment and follow-up (3, 6, 12 months) 3. Self-rated improvement measured on a Likert scale of 0 - “nothing has changed” to 10 - “I reached my goal”at follow-up (3, 6, 12 months)

—

Countries

Canada

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026