Many websites offer online cessation programs to help you stop smoking. Listed here are just a few of them.  Most of these are free but require registration.

This list is for information only and inclusion does not constitute endorsement.

The material contained on this site and on the associated web pages is general information and is not intended to be advice on any particular matter. Visitors should seek appropriate professional advice before acting on the basis of any information contained herein.

Stop Smoking Center
Features of this site include a customized quit program, an online support group, promotion of a toll-free helpline, interactive assessment tools, quitting tips, access to "quitting buddies," motivational emails and help for friends or family members of smokers. Visitors can use the site free of charge. 
www.stopsmokingcenter.net

4-Week Online Program
Catherine Salveson's 4-week online smoking cessation program, developed by a Registered Nurse. Information and access is available from WebMD.
http://boards.webmd.com/message.asp?
message_id=2448835

Try To Stop
Online cessation assistance provided at no charge by the Massachusetts Department of Health through an interactive "Quit Wizard." This website also includes information on support networks and other helpful websites, facts about tobacco products, cigarette ingredients and secondhand smoke, expert advice, success stories and "e-cards" to send to friends or family members.  www.trytostop.org

The Gay American Smoke Out
Created to coincide with the American Cancer Society's "Great American Smokeout". The Gay American Smoke Out is an opportunity for Lesbian, Gay, Bisexual and Transgendered (LGBT) individuals to challenge themselves to quit smoking.
www.gaysmokeout.net

iQuit: A Quit Site for LGBT Smokers
Do you want to quit smoking? Researchers at the University of California, San Francisco are looking for lesbian, gay, bisexual, and transgender smokers to take part in a FREE Internet-based smoking treatment program.
http://iquit.medschool.ucsf.edu

UCSF Stop Smoking
University of California is seeking participants in their free Internet smoking cessation program study.
www.stopsmoking.ucsf.edu

Smoking Control Program
Interactive online smoking control program using seminars and workbooks.  Based on reducing use before quitting.  Services are not free. 
www.smokingcontrolsystems.com/index.asp

Taper Off
Web-based service to assist smokers who want to quit gradually using "scheduled reduction."  The site is free to try for 4 days, after that the fee is $25 for up to 90 days of continued access. 
www.taperoff.net