In the iCO App Study, we are aiming to recruit pregnant (or recently pregnant) women who smoke to test a new app. The new app, called "myCOtrak", lets users record a daily carbon monoxide reading as well as logging their smoking and use of other nicotine products.

The iCO study is funded by the NIHR School for Primary Care Research and is led by Professor Tim Coleman (University of Nottingham) and Dr Joanne Emery (University of East Anglia).

Download the Participant Information Sheet



We want to improve the support that women receive to help them stop smoking during pregnancy. The growing use of electronic tools, such as smartphone apps, has created new opportunities to reach people with more convenient stop smoking support. As part of this, we have created a smartphone app (‘myCOtrak’) that lets people record how much they smoke or use e-cigarettes (vapes) or nicotine replacement therapy (NRT). The app works with a hand-held personal device called an ‘iCO monitor’ for measuring how much carbon monoxide (CO) people breathe out. The amount of carbon monoxide on people’s breath is a very strong marker of how much they smoke. 

Aims and objectives

For the iCO App Study, we are aiming to recruit pregnant (or recently pregnant) women who smoke to test the myCOtrak app by using this for 28 days. Participants will be asked to submit a daily CO reading (taken using the iCO monitor) and to respond to app questions about their smoking and nicotine use over the past 24 hours. After testing the app, we will seek participants' feedback on this.

The study will tell us how closely the myCOtrak app data on heaviness of smoking matches CO readings in breathed out air. This information will help us to decide how best to use the app and iCO monitors to help people stop smoking during pregnancy.

Instructional Videos

We've produced a couple of videos to help you with using the application, for Android and Apple system users. 

Android instructional video

Apple instructional video


If you want to get in touch with us about this study, please email