Table 3. Schedule of enrolment and follow-up assessments.

Assessment	Time point
	Baseline	4 weeks	16 weeks	30 weeks
Initial approach	x
Informed consent	x
Eligibility screen	x
Randomisation	x
Intervention/comparator initiation	x
Sociodemographic characteristics1	x
Cigarette consumption and level of addiction	x	x	x	x
Quit history and past use of cessation support	x
Current use of cessation support	x	x	x	x
Quit attempts		x
Smoking cessation		x	x	x
App use				x
Resting heart rate2	x			x
Debriefing				x

¹Sociodemographic characteristics include: age, sex, education, subjective financial status, country of residence and first language.

²Current resting heart rate will be self-reported by participants who have a heart rate monitoring device (e.g. FitBit).