Feasibility Outcomes.
Feasibility outcomes used to estimate key parameters to inform a future trial included:Completeness of the anticipated primary outcome for a future definitive trial (see smoking outcomes).Abstinence rate of usual care arm (anticipated primary outcome).Advertising cost per recruit.Rates of app installation, use, and acceptability (recommend Quit Sense to a friend and ease of use [5-point scale]).Completion of smoking cessation-related resource use, including usual care use, and quality of life (EQ-5D-5L)Hypothesized mechanisms of action of Quit Sense (see smoking outcomes).