DMT use in Cluster Headache: Interim Analysis of an International Survey (S23.003) | Neurology
"Among those who used DMT to abort attacks (n = 85), the majority reported it completely eliminates pain (67.5%) and that it works every (45.7%) or almost every (35.8%) single time. Over half reported that DMT worked in under 30 seconds, and all participants reported either no change or an improvement in their health with DMT use."