A large-scale television-based smoking cessation project was implemented for 20 days during January, 1985. As part of this project a group of corporations were randomly assigned to two conditions. One received self-help manuals to go along with the television broadcasts. The other group, in addition to manuals and televised programs, could attend twice weekly self-help support group meetings. Twelve-month follow-up self-reports of smoking, verified by cotinine analyses, are reported in this study. In a previous report, it was found that support groups at the worksite did increase the effectiveness of the television and self-help manual intervention at the post-intervention measurement and the 3-month follow-up. At the 12-month follow up, there were no significant differences in abstinence rates between those provided groups at the work setting versus those not provided groups.