overmatig cannabisgebruik heavy cannabis use smoking weed
Conditions
Interventions
The online training, a progressive web app, is based on the principles of the
Screening Brief Intervention and Referral to Treatment (SBIRT) approach. The
brief intervention component is based on co
Sponsors
Trimbos-instituut
Eligibility
Age
18 Years to 99 Years
Inclusion criteria
Inclusion criteria: -Age 18+ -Cannabis use on 3 or more days a week in the past month -Desire to reduce or quit cannabis use -Smartphone available -Ability and intention to participate in the intervention and study for the period of 6 months -Informed consent provided
Exclusion criteria
Exclusion criteria: -Formal treatment (psycho-social or pharmacological) for cannabis use or any other substance use in the past 3 months -Insufficient mastery of the Dutch language -Self-reported suicidal ideation, acute psychosis or severe depression -Pregnant or lactating
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| 1. Frequency of cannabis use: the number of smoking days in the past 7 days assessed 6 months post-randomisation using the Timeline Followback method. | — |
Secondary
| Measure | Time frame |
|---|---|
| 2. Quantity of cannabis used (grams) in the past 7 days assessed 6 months post- randomisation using the Timeline Followback method. 3. Cannabis use related problems as measured using the Cannabis Use Disorder Identification Test (CUDIT). 4. Severity of dependence (number of self-reported DSM-5 criteria met). 5. Number of serious attempts to quit or reduce cannabis (self-report). A serious quit attempt is defined as one lasting at least 24 hours. 6. Help seeking attitude as measured using the Mental Help Seeking Attitudes Scale (MHSAS). An additional questionnaire used in previous research on help seeking attitudes among frequent cannabis users is also include. 7. Number of participants that entered specialised drug treatment 6-months post randomization (self-report). 8. Quality of life as measured with SF-6D. 9. Treatment satisfaction as measured with the Dutch version of the ZUF-8. 10. Demographics: age, sex, level of education. 11. Substance use (tobacco, alcohol, cocaine, amphetamine, inhalants, sedatives, hallucinogens, opioids and other drugs). 12. MCSDS: Marlowe Crowne Social Desirability Scale will be included to evaluate the reliability of the self-reported questionnaire data. 13. TiC-P: Direct non-medical cost data and productivity will be measured. 14. Number of self-reported cannabis withdrawal symptoms. 15. Marijuana Craving Questionnaire Short Form (MCQ-SF ) will be included to assess craving for cannabis. 16. The Brief Symptom Inventory 18 (BSI-18) will be included to assess symptoms of anxiety and depression. 17. Self-efficacy to become or stay a non-smoker and resist cannabis will be measured by 6 items used in previous research. 18. The Cannabis self-concept scale will be included to assess identification with cannabis as part of the participant*s personality or identity. 19. Utilization variables will be collected during use of the intervention: number of logins, number of page views, time spend logged in, use of major | — |
Countries
Netherlands
Outcome results
None listed