Hallucinogens like LSD and psilocybin distort sensory perceptions and were widely used in experiments from the 1940s-1960s. LSD was first synthesized in 1938 and can produce hallucinations with very small amounts. Effects include vivid colors, anxiety, increased heart rate, and extreme emotions. Treatment involves detox and therapies like cognitive behavioral therapy and support groups. Marijuana is derived from cannabis plants and smoked or steeped in tea. It causes euphoria, time distortion, and enhanced senses but can also relieve pain. Effective treatments include relapse prevention and support groups which have reduced marijuana use after treatment.