Your total participation in this study will last about 8 months. This will include a 3-month and 6-month follow-up visit after your scheduled quit date. If the study staff is not able to reach you by phone, mail, or the information provided by your contacts, they may try to locate you through telephone directory assistance (411) or internet search sources (for example, Google or Yahoo!), which use information from the public domain (meaning everyone has access to it). If the study staff is still unable to find you, they may use a locator service such as Transunion or the National Change of Address (NCOA) database maintained by the United States Postal Service, as a last resort. Transunion uses magazine subscriptions and credit applications to find new addresses, and the NCOA uses the Change of Address cards filed with the post office when a person moves and requests their mail be forwarded to a new address. If the study staff has to use either of these services, they would only disclose your name and last known address.