title: mHealth App for Cannabis Users: Satisfaction and Perceived Usefulness.
abstract: OBJECTIVE
  The aim of this study was to describe the characteristics of cannabis users and their levels of satisfaction with Stop-cannabis, an app intended for cannabis users who want to stop or reduce their cannabis use or prevent relapse.
  
  
  METHODS
  A cross-sectional online survey was administered to users of Stop-cannabis, a French-language app for iOS and Android devices. All app users were invited to participate in the survey via a message sent to the app.
  
  
  RESULTS
  For hundred and eighty-two users answered the survey. The app was used daily by 348 of the participants (around 70%). More than 80% of participants (397) considered the app to have helped them "a little" or "a lot" to stop or reduce cannabis consumption. Most of the users' suggestions were related to the number or the quality of the messages sent by, or displayed in, the app.
  
  
  CONCLUSIONS
  This pilot study supports the feasibility of such an app and its perceived usefulness. A self-selection bias, however, limits the conclusions of the study. The efficacy of the app should be evaluated in a randomized controlled trial.
authors.affiliation: Department of Mental Health and Psychiatry, Geneva University Hospitals , Geneva , Switzerland ; Faculty of Medicine, Institute of Global Health, University of Geneva , Geneva , Switzerland.
authors.forename: Grégoire
authors.initials: G
authors.lastname: Monney
authors.affiliation: Department of Mental Health and Psychiatry, Geneva University Hospitals , Geneva , Switzerland.
authors.forename: Louise
authors.initials: L
authors.lastname: Penzenstadler
authors.affiliation: Faculty of Medicine, Institute of Global Health, University of Geneva , Geneva , Switzerland.
authors.forename: Olivia
authors.initials: O
authors.lastname: Dupraz
authors.affiliation: Faculty of Medicine, Institute of Global Health, University of Geneva , Geneva , Switzerland ; Department of Psychiatry, University of Geneva , Geneva , Switzerland.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Etter
authors.affiliation: Department of Mental Health and Psychiatry, Geneva University Hospitals , Geneva , Switzerland ; Department of Psychiatry, University of Geneva , Geneva , Switzerland.
authors.forename: Yasser
authors.initials: Y
authors.lastname: Khazaal
keywords: addiction; app; cannabis; cognitive behavior therapy; mhealth; smartphone