The guideline committee has made the following recommendations for research.
How effective and cost effective are stop smoking interventions delivered using web‑based packages or apps?
What is the validity of different thresholds of carbon monoxide in exhaled breath as markers of quitting, based on diagnostic review and modelling?
Recommended thresholds for showing that a person has stopped smoking vary depending on factors such as the measurement method, the target population, when the guidance was developed and manufacturer recommendations. Being around other smokers or in areas with heavily polluted air can influence the accuracy of the results. It is important to have valid markers of abstinence to monitor the success of interventions.