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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.
TLDR: There are two types of sensations, fine and crude. Pain is an example of a crude sensation and touch is an example of a fine sensation. Both crude and fine sensory pathways are activated together, and when they are, the fine sensations generally overwhelm the crude sensations. That's why when you feel pain, touching it makes it feel better.