QuitTobacco.org About this site: If you're a smoker who's ready to quit, a smoker on the fence about quitting, or the friend or family member of a would-be quitter, you'll find plenty of helpful information on this site. Developed by Group Health Cooperative, a Seattle-based HMO, the site includes a bulletin board where users can exchange support and information or ask questions. (http://www.quittobacco.org/   Pluses: Much of the information on the site comes from the HMO's paid quit-smoking program, Free and Clear, which the Centers for Disease Control and Prevention describes as a model for successful smoking cessation programs.   Minuses: The section on nicotine replacement products and supplemental medications is weighted towards one particular product (Zyban) that is part of the HMO's paid quit-smoking program.   Best feature: A calculator helps smokers figure out how much they will spend on cigarettes in a month, in a year, and in ten years

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