%0 Journal Article %T Lessons learned from unsuccessful use of personal carbon monoxide monitors to remotely assess abstinence in a pragmatic trial of a smartphone stop smoking app ¨C A secondary analysis %A Jamie Brown %A Lion Shahab %A Robert West %J Archive of "Addictive Behaviors Reports". %D 2019 %R 10.1016/j.abrep.2018.07.003 %X Verifying abstinence remotely in trials of digital cessation interventions remains a major challenge. This study reports on using personal carbon monoxide (CO) monitors to assess abstinence in a pragmatic trial of a standalone cessation app involving automated recruitment with no researcher contact %K Smoking cessation %K Intervention %K Smartphone %K App %K Pilot %K Carbon monoxide %K Biochemical verification %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6542188/