IMPORTANCE Cannabis withdrawal syndrome (CWS)-a diagnostic indicator of cannabis use disorder-commonly occurs on cessation of heavy and prolonged cannabis use. To date, the prevalence of CWS syndrome has not been well described, nor have the factors potentially associated with CWS.

A low-intensity CBT-based music group can be successfully administered to clients of community mental health services. There are indications of effectiveness in reducing disability, although there appears to be negligible effect on symptoms of anxiety and depression. This is the first report of a trial of a low-intensity CBT-based music group intervention.

IMPORTANCE Cannabis withdrawal syndrome (CWS)-a diagnostic indicator of cannabis use disorder-commonly occurs on cessation of heavy and prolonged cannabis use. To date, the prevalence of CWS syndrome has not been well described, nor have the factors potentially associated with CWS.

Cognitive behavioural therapy-based music (CBT-Music) group is a nine-week guided self-help group for individuals with mild-to-moderate symptoms of anxiety and/or depression. This is a novel treatment developed for use in a community-based mental health setting. A feasibility study (a randomized control trial) has shown promising results for the CBT-Music group.