Relapse proves treatment failure and lack of willpower

Quality and quantity of direct evidence for or against the claim — RCTs, systematic reviews, natural experiments, large cohort studies.

Relapse rates for addiction are comparable to other chronic diseases like diabetes and hypertension, directly contradicting the moral-weakness framing implied by the claim.

Whether the proposed mechanism is valid and established — does the how make sense, or are there fundamental flaws in the causal logic?

The willpower-failure mechanism cannot account for addiction's documented neurobiological substrates or for relapse rates declining substantially with treatment access rather than with willpower interventions.

Degree of agreement among domain experts and relevant scientific or policy bodies — depth and quality of consensus, not just majority opinion.

Addiction medicine consensus classifies substance use disorder as a chronic relapsing brain disorder, rejecting the treatment-failure/willpower framing.

Whether findings hold across independent studies, populations, and contexts — resistance to p-hacking and publication bias.

The chronic-disease-comparable relapse pattern replicates across studies comparing addiction treatment outcomes to diabetes and hypertension management.