Smoking

• Pfizer Investigational Site — Chuo-ku Fukuoka, Fukuoka, Japan
• Pfizer Investigational Site — Nishi-ku Yokohama, Kanagawa, Japan
• Pfizer Investigational Site — Beppu, Oita Prefecture, Japan
• Pfizer Investigational Site — Ōita, Oita Prefecture, Japan

• Pfizer Investigational Site — Beijing, China

• National Cancer Institute (NCI) — Bethesda, Maryland, United States

• National Cheng Kung University Hospital — Tainan, Taiwan

• VA/Nebraska/Western Iowa Health Care System — Omaha, Nebraska, United States

• Connecticut Mental Health Center, SAC-115 — New Haven, Connecticut, United States

• American Academy of Family Physicians National Research Network — Leawood, Kansas, United States

• University of Minnesota, Division of Epidemiology, School of Public Health, Epidemiology Clinic Research Center, Suite 201, 1100 Washington Avenue South — Minneapolis, Minnesota, United States

• Virginia Ambulatory Care Outcomes Network (ACORN) — Richmond, Virginia, United States

Not specified