Psychological dependency is addressed in many drug rehabilitation programs by attempting to teach the person new methods of interacting in a drug-free environment. In particular, patients are generally encouraged, or possibly even required, to not associate with peers who still use the addictive substance. Twelve-step programs encourage addicts not only to stop using alcohol or other drugs but to examine and change habits related to their addictions. Many programs emphasize that recovery is an ongoing process without culmination. For legal drugs such as alcohol, complete abstention—rather than attempts at moderation, which may lead to relapse—is also emphasized ("One is too many, and a thousand is never enough.")