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Table 1.

Characteristics of research cigarettes

	Usual brand	Research cigarettes nominal nicotine content
	Usual brand			12 mg	8 mg	4 mg	2 mg	1 mg
Measured nicotine content (mg)	NM	10.1	7.4	3.5	1.5	0.6
Tobacco weight (mg)	NM	624	619	620	618	614
FTC method
Nicotine (mg)	1.0 (0.9-1.2)*	0.8	0.6	0.3	0.2	0.1
Tar (mg)	12.2 (10.8-13.7)*	10.9	10.9	7.8	9.2	10.2
Carbon monoxide (mg)	12.6 (11.7-13.5)	11.3	12.0	10.8	12.0	10.7
NNK (ng)	NM	63	67	64	57	56
Pyrene (ng)	NM	41	38	51	43	34
Naphthalene (ng)	NM	662	560	470	466	553
Phenanthrene (ng)	NM	120	120	106	113	132
Fluorene (ng)	NM	145	143	149	153	129

	Usual brand	Research cigarettes nominal nicotine content
	Usual brand			12 mg	8 mg	4 mg	2 mg	1 mg
Measured nicotine content (mg)	NM	10.1	7.4	3.5	1.5	0.6
Tobacco weight (mg)	NM	624	619	620	618	614
FTC method
Nicotine (mg)	1.0 (0.9-1.2)*	0.8	0.6	0.3	0.2	0.1
Tar (mg)	12.2 (10.8-13.7)*	10.9	10.9	7.8	9.2	10.2
Carbon monoxide (mg)	12.6 (11.7-13.5)	11.3	12.0	10.8	12.0	10.7
NNK (ng)	NM	63	67	64	57	56
Pyrene (ng)	NM	41	38	51	43	34
Naphthalene (ng)	NM	662	560	470	466	553
Phenanthrene (ng)	NM	120	120	106	113	132
Fluorene (ng)	NM	145	143	149	153	129

Abbreviation: NM, not measured.

Mean (95% CI).