RESULTS Although causality is unclear , heavy and dependent cannabis use is consistently associated with a high prevalence of comorbid psychiatric disorders and learning and memory impairments that seem to recover after a period of abstinence .
Evidence regarding other cognitive domains and neurological consequences including cerebrovascular events is limited and inconsistent .
Abstinence after treatment is only achieved in a minority of cases ; treatment targeted at reduction in use appears have some success .
Potential moderators of the impact of CUD on the brain include age of onset , heaviness of use , CUD severity , the ratio of ∆9-tetrahydrocannabinol to cannabidiol , and severity of comorbid disorders .
Current evidence of long-term effects of daily cannabis use and cannabis use disorder on brain-related outcomes is suggestive rather than conclusive but use is associated with psychiatric morbidity and with cognitive impairments that recover after a period of abstinence
AIMS To summarize and evaluate our knowledge of the relationship between heavy cannabis use , Cannabis Use Disorder ( CUD ) , and the brain .
The Cannabis Use Problems Identification Test (CUPIT): development, reliability, concurrent and predictive validity among adolescents and adults.
AIMS To describe the empirical construction and initial validation of the Cannabis Use Problems Identification Test ( CUPIT ) , a brief self-report screening instrument for detection of currently and potentially problematic cannabis use . DESIGN In a three-phase prospect i ve design an item pool of c and i date questions was generated from a literature review and extensive expert consultation . The CUPIT internal structure , cross-sectional and longitudinal psychometric properties were then systematic ally tested among heterogeneous past-year users . PARTICIPANTS Volunteer participants were 212 high-risk adolescents ( n = 138 ) and adults ( n = 74 ) aged 13 - 61 years from multiple community setting s. MEASUREMENTS The comprehensive assessment battery included several established measures of cannabis-related pathology for CUPIT validation , with DSM-IV/ICD-10 diagnoses of cannabis use disorders as criterion st and ard . FINDINGS Sixteen items loading highly on two subscales derived from principal components analysis exhibited good to excellent test-retest ( 0.89 - 0.99 ) and internal consistency reliability ( 0.92 , 0.83 ) , and highly significant ability to discriminate diagnostic subgroups along the severity continuum ( non-problematic , risky , problematic use ) . Twelve months later , baseline CUPIT scores demonstrated highly significant longitudinal predictive utility for respondents ' follow-up diagnostic group membership . Receiver operating characteristic ( ROC ) analysis identified a  CUPIT score of 12 to be the optimal cut-point for maximizing sensitivity for both currently diagnosable cannabis use disorder and those at risk of meeting diagnostic criteria in the following 12 months . CONCLUSIONS The CUPIT is a brief cannabis screener that is reliable , valid and acceptable for use across diverse community setting s and consumers of all ages . The CUPIT has clear potential to assist with achievement of public health goals to reduce cannabis-related harms in the community
RESULTS Although causality is unclear , heavy and dependent cannabis use is consistently associated with a high prevalence of comorbid psychiatric disorders and learning and memory impairments that seem to recover after a period of abstinence .
Evidence regarding other cognitive domains and neurological consequences including cerebrovascular events is limited and inconsistent .
Abstinence after treatment is only achieved in a minority of cases ; treatment targeted at reduction in use appears have some success .
Potential moderators of the impact of CUD on the brain include age of onset , heaviness of use , CUD severity , the ratio of ∆9-tetrahydrocannabinol to cannabidiol , and severity of comorbid disorders .
Current evidence of long-term effects of daily cannabis use and cannabis use disorder on brain-related outcomes is suggestive rather than conclusive but use is associated with psychiatric morbidity and with cognitive impairments that recover after a period of abstinence
AIMS To summarize and evaluate our knowledge of the relationship between heavy cannabis use , Cannabis Use Disorder ( CUD ) , and the brain .