Which factor is least likely to influence the success of treatment for substance use disorders?

The least likely factor to influence the success of treatment for substance use disorders is the client’s financial status. While financial resources can impact access to certain treatment modalities, the actual success of treatment is more strongly associated with intrinsic factors, such as the client's motivation to change and the social support they receive during recovery.

Client motivation is crucial, as individuals who are motivated are more likely to engage actively in their treatment plans and follow through with recovery strategies. Social support can significantly enhance a client's experience and progress in treatment, providing encouragement and accountability.

The duration of treatment can also play a critical role, as longer treatment periods are often correlated with better outcomes, giving clients ample time to develop and practice new coping strategies and integrate into supportive communities. However, even if a client has limited financial resources, with sufficient motivation and social support, they can still experience successful outcomes in their recovery journey.