Which one of the following is not an established twelve-step program?

The selection of Hallucinogens Anonymous as the answer is based on the fact that it does not have the same level of recognition and establishment as the other listed twelve-step programs. Narcotics Anonymous, Cocaine Anonymous, and Alcoholics Anonymous are well-known and widely practiced support groups following the twelve-step model, which is foundational in aiding individuals struggling with substance use disorders.

Alcoholics Anonymous was established in the 1930s and focuses on recovery from alcoholism. Narcotics Anonymous was founded shortly after and serves those who struggle with addiction to narcotics, while Cocaine Anonymous is specifically geared towards those dealing with cocaine addiction. These programs have structured frameworks, literature, and community support networks that contribute to their recognized status within addiction recovery.

In contrast, Hallucinogens Anonymous is much less established, lacking the widespread recognition and structured support framework of the other three programs. It operates on a basis more informal and is not included in the established array of twelve-step programs that have gained acceptance in recovery communities. This distinction makes Hallucinogens Anonymous the correct answer to the question regarding which is not an established twelve-step program.