They subsequently participate in an end-of-day diary phase from 7 days before and until 20 days after a self-set quit date. All participants fill out a baseline diary for three consecutive days and are invited to the lab for a background assessment. In addition, the intervention group is instructed to use the SmokeFree Buddy app, a multicomponent app that also facilitates smoking-cessation specific social support from a buddy over a smartphone application. Both intervention and control group use a smartphone-compatible device for measuring their daily smoking behavior objectively via exhaled carbon monoxide. Blocking as means of group-balanced randomization is used to allocate participants to intervention or control conditions. Participants of this study are adult smokers who smoke at least one cigarette per day and intend to quit smoking at a self-set quit date. This protocol describes the design of a single-blind, two-arm, parallel-group, intensive longitudinal randomized controlled trial. This randomized controlled trial investigates the effectiveness of a smartphone app in which smokers quit smoking with the help of a social network member. The social context of smokers has, however, been neglected in smartphone apps promoting smoking cessation. Smartphone apps offer new promising opportunities for supporting smoking cessation in real-time. Tobacco smoking remains one of the biggest public health threats.
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