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Because our study design was observational, it is possible that other factors may explain the observed associations; for example, greater concern for one's health or a tendency to “comply” might lead to greater use of the supervised injecting facility, as well as more ready acceptance of detoxification. In this regard, we have previously shown that greater use of the supervised injecting facility is associated with markers traditionally associated with reduced access to care, including a higher intensity of drug use and homelessness.5 In addition, contact with the addictions counselor was among the strongest independent predictors of more rapid entry into a detoxification program. Our findings provide reassurance that supervised injection facilities (Figure 1) are unlikely to result in reduced use of addiction-treatment services.