Inclusion Criteria:  inpatients for cocaine detoxification in our addiction unit who live in Barcelona or surroundings abstinent at the time of the study assessment (from the third day of hospitalization) 18 years of age or older.  Exclusion Criteria:  indication of treatment for reasons other than cocaine detoxification, presence of serious psychopathological or neuropsychological alterations that hinder the participation in the study (including severe intoxication) opioid abuse or dependence during the last year (this criteria includes maintenance treatment with methadone or another opioid substance) a lack of Spanish or Catalan knowledge or difficulties to read or write that hamper the participation in the study, Non-acceptance of the study procedures, such as the signing of informed consent.