Acidhead
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Acidhead is a word, often derogatory, for someone who regularly uses the substance Lysergic Acid Diethylamide, which to many is known as LSD or acid.
Lysergic Acid Diethylamide, is a drug which some consider hard to abuse, claiming that it is difficult to use in the same manner as the familiar substances of abuse such as alcohol or opiates. Because of its rapid onset of tolerance it is virtually impossible to use on an every day basis.
In large doses the user can experience what some refer to as, "great insights", "blinding truths", "revelations", "epiphanies", or "ego death". It is this characteristic which gave the drug successes in its trials as a tool in psychotherapy.
An acidhead will sometimes appear unable to interact with their surroundings because of the psychedelic and hallucinogenic effect of the drug.