Table 1

Tobacco products used for this study

	No	Type	Brand	Expected flavour
Expected characterising flavour products	1	Roll-your-own	RYO-TP2	Menthol
	2	Cigarette	Cig-TP13	Menthol
	3	Cigarette	Cig-TP2	Menthol
	4	Cigarette	Cig-TP1	Menthol
	5	Cigarette	Cig-TP14	Menthol
	6	Cigarette	Cig-TP15	Menthol
	7	Cigarette	Cig-TP5	Cherry
	8	Cigarette	Cig-TP16	Vanilla
	9	Roll-your-own	RYO-TP3	Vanilla
	10	Roll-your-own	RYO-TP1	Vanilla
	11	Cigarette	Cig-TP4^{^*}	Vanilla
	12	Cigarette	Cig-TP8^{^*}	Chocolate
	13	Cigarette	Cig-TP7^{^*}	Unknown
	14	Cigarette	Cig-TP9	Apple
	15	Cigarette	Cig-TP12	Strawberry
	16	Cigarette	Cig-TP10	Honey
	17	Cigarette	Cig-TP11	Mango
	18	Cigarette	Cig-TP17	Mango
	19	Cigarette	Cig-TP18	Pina Colada
	20	Cigarette	Cig-TP19	Mojito
	21	Cigarette	Cig-TP6^{^*}	Chocolate
	22	Cigarette	Cig-TP3^{^*}	Chocolate
Expected non-characterising flavour products	23	Cigarette	Cig-RP1	Tobacco
	24	Cigarette	Cig-RP2	Tobacco
	25	Cigarette	Cig-RP3	Tobacco
	26	Cigarette	Cig-RP4	Tobacco
	27	Cigarette	Cig-RP5	Tobacco
	28	Cigarette	Cig-RP6	Tobacco
Reference products	29	Cigarette	Coresta Monitor 6 (CM6)	-
	30	Cigarette	University of Kentucky (3R4F)	-
	31	Leaves	American Virginia flue cured 2013	-
	32	Leaves	Un-cut Burley	-
	33	Leaves	Semi-Oriental 456	-

↵* The flavour of these products could not be inferred from the product packages. These products were included based on information from employees in tobacco shops and the internet (Cig-TP4 and Cig-TP8, the colourful design of the package (Cig-TP7), or ingredient lists that manufacturers annually send to the National Institute for Public Health and the Environment (RIVM)10 (Cig-TP6 and Cig-TP3).