Table 2

Details of follow-up

Timing	Call 1			Call 2	Call 3	Call 4	Call 5	Call 6
Timing	Week 0			Quit date (QD)	One month after QD	Three months after QD	Six months after QD	12 months after QD
Description	Screening (S), Baseline (B), Randomisation (R)			Endpoint	Endpoint	Endpoint	Endpoint	Endpoint
General data
Eligibility criteria	X
Consent	X
Age and gender		X
Height		X
Weight		X				X	X	X
Ethnicity		X
Education		X
Current medication		X		X	X	X	X	X
General health		X		X	X	X	X	X
Pregnancy	X			X	X	X
Smoking information
Level of nicotine dependence		X
Type of tobacco smoked		X
Pouch size and how long lasts*		X
Cigarettes smoked per day		X		X	X	X	X	X
Age started		X
Years smoked		X
Household smoking		X
Around others that use e-cigarettes		X				X
Previous quit attempts & method		X
Belief in ability to quit		X		X	X
Any smoking in last 7 days				X	X	X	X	X
Any smoking since QD					X	X	X	X
Biochemical verification in those who self-report quitting							X	X
Withdrawal/urge to smoke		X		X	X	X	X	X
Follow-up details
Quit date			X	X
Contact details			X	X	X	X	X	X
Treatment allocation and details			X
Use of non-NRT cessation methods
Type of cessation method used					X	X	X	X
Intervention period
Acceptability/perceptions					X	X	X	X
Recommendations					X	X	X	X
Medication compliance				X	X	X
Other outcomes
Crossover				X	X	X	X	X
Additional e-cigarette support†				X	X	X	X	X
Dual use				X	X	X	X	X
Cost				X	X	X	X	X
Continuation of allocated treatment							X	X
Side effects/serious adverse events				X	X	X	X	X
Identity						X	X	X