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DMT is a powerful hallucinogen, meant to be carefully administered in a calm environment to someone who has prior experience with other psychedelic drugs. The drug is relatively rare due to the lack of commercial demand and the scarcity of people with the knowledge and motivation to isolate it from plants.
The shock from an ICD hurts briefly. It's been described as feeling like a punch in the chest. But the shock is a sign that the ICD is doing its job to keep your heart beating. You won't feel any pain if the ICD uses electrical pulses to fix a heart rate that is too fast or too slow.