This year's Great American Smokeout® will be held by the American Cancer Society on November 17, 2005.
The event encourages smokers to quit cigarettes for at least one day, with the aim they might quit permanently.
See quitforyou.org for more information. The site includes blog posts from people quitting smoking.
Source: "South Atlantic Great American Smoke Out Blog" by Randy Moss on the Community Mobilization blog.
See also: Wikipedia:Great American Smokeout.