Table 1. Cigarette Brands Tested and Their Attributed Codes.

code	brand	supplier
M1	Marlboro Silver	Philip Morris
M2	Marlboro Gold	Philip Morris
M3	Marlboro	Philip Morris
M4	Marlboro Blue Ice	Philip Morris
M5	Marlboro Fresh Mint	Philip Morris
S1	Dunhill	Souza Cruz
S2	Lucky Strike	Souza Cruz
S3	Derby	Souza Cruz