Table 1. Basic characteristics of participants according to smoking status and type of tobacco product.

		Total (n = 4,926)		Non-smokers (n = 4,077)		Only combustible cigarette smokers (n = 700)		HTP smokersa (n = 149)
		n	%	n	%	n	%	n	%
Men	Total	2,443	100	1,858	76.1	472	19.3	113	4.6
	Age, years
	20–29	486	19.9	390	21.0	54	11.4	42	37.2
	30–39	489	20.0	375	20.2	84	17.8	30	26.5
	40–49	492	20.1	355	19.1	115	24.4	22	19.5
	50–59	486	19.9	358	19.3	114	24.2	14	12.4
	60–69	490	20.1	380	20.4	105	22.2	5	4.4
	Equivalent income, JPY/year
	<2 million	571	23.4	463	24.9	95	20.1	13	11.5
	2.00–2.99 million	533	21.8	407	21.9	105	22.3	21	18.6
	3.00–3.99 million	502	20.5	363	19.5	111	23.5	28	24.8
	≥4 million	837	34.3	625	33.7	161	34.1	51	45.1
Women	Total	2,483	100	2,219	89.4	228	9.2	36	1.4
	Age, years
	20–29	496	20.0	454	20.5	24	10.5	18	50.0
	30–39	495	19.9	453	20.4	36	15.8	6	16.7
	40–49	497	20.0	427	19.2	63	27.6	7	19.4
	50–59	497	20.0	435	19.6	59	25.9	3	8.3
	60–69	498	20.1	450	20.3	46	20.2	2	5.6
	Equivalent income, JPY/year
	<2 million	673	27.1	593	26.7	72	31.6	8	22.2
	2.00–2.99 million	576	23.2	528	23.8	43	18.9	5	13.9
	3.00–3.99 million	549	22.1	491	22.1	47	20.6	11	30.6
	≥4 million	685	27.6	607	27.4	66	28.9	12	33.3

HTP, heated tobacco product.

^aHTP smokers include smokers using only HTPs or HTPs and other tobacco products.