title: A study to investigate changes in the levels of biomarkers of exposure to selected cigarette smoke constituents in Japanese adult male smokers who switched to a non-combustion inhaler type of tobacco product.
abstract: In a clinical study, changes in 14 biomarkers of exposures (BOEs) from 10 tobacco smoke constituents and mutagens detected by the urine mutagenicity test were investigated using a non-combustion inhaler type of tobacco product (NCIT) by switching from a conventional cigarette. This study was conducted in 80 Japanese healthy adult males with a 4-week residential, controlled, open-label, parallel group design. After randomization, 40 smokers used NCIT with approximately 750 aspirations, other 20 smokers smoked approximately 20 pieces of an assigned 1-mg ISO tar conventional cigarette (CC1) every day. Twenty non-smokers (NS) did not use any tobacco product. Under this study condition, switching from cigarette to NCIT showed significant reduction in all BOEs measured. On day 29, the levels of these BOEs were almost the same as those in the NS group, except BOEs of nicotine and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK). This suggested that the exposure to 8 constituents and mutagens in the NCIT group was similar to that in the NS group, while the exposure to nicotine was higher. Although the precise exposure level to NNK was not estimated because of the long half-life of its BOE, it would be substantially lower in the NCIT group than in the CC1 group.
authors: Product Science Division, R&D Group, Japan Tobacco Inc., Yokohama, Kanagawa, Japan. Electronic address: naoki.miura@jt.com.
authors: Naoki
authors: N
authors: Miura
authors: Product Science Division, R&D Group, Japan Tobacco Inc., Yokohama, Kanagawa, Japan.
authors: Dai
authors: D
authors: Yuki
authors: Product Science Division, R&D Group, Japan Tobacco Inc., Yokohama, Kanagawa, Japan.
authors: Naoki
authors: N
authors: Minami
authors: Product Science Division, R&D Group, Japan Tobacco Inc., Yokohama, Kanagawa, Japan.
authors: Aoi
authors: A
authors: Kakehi
authors: Product Science Division, R&D Group, Japan Tobacco Inc., Yokohama, Kanagawa, Japan.
authors: Yasuyuki
authors: Y
authors: Futamura
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood / Q000652:urine; D001774:Blood Chemical Analysis; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009152:Mutagenicity Tests; D009153:Mutagens / Q000009:adverse effects*; D018570:Risk Assessment; D012906:Smoke / Q000009:adverse effects*; D012907:Smoking / Q000009:adverse effects* / Q000097:blood / Q000652:urine; D013997:Time Factors; D062789:Tobacco Products / Q000009:adverse effects*; D014030:Tobacco, Smokeless / Q000009:adverse effects*; D016482:Urinalysis; D055815:Young Adult
chemical_list: D015415:Biomarkers; D009153:Mutagens; D012906:Smoke
keywords: Biomarkers; Cigarette; Clinical study; Exposure; Smokeless tobacco; Smoking