LSD

From Drug Rehab Wiki

Lysergic acid diethylamide (commonly known as acid or LSD)is an hallucinogen that causes expansion and an altered experience of senses, emotions, memories, time, and awareness for 6 to 14 hours, depending on dosage and tolerance. While LSD isn't considered addictive in the medical community, an LSD trip can have long-term psychoemotional effects; some users cite the LSD experience as causing significant changes in their personality and life perspective. "Flashbacks" are a reported psychological phenomenon in which an individual experiences an episode of some of LSD's subjective effects long after the drug has worn off.