The mind-altering effects of hashish dissipate after a couple of hours.
Magic mushrooms can cause a wide variety of perceptual changes including pupil dilation, visuals, mental stimulation, new perspectives, a feeling of insight, quickly changing emotions (lots of laughter), possible paranoia and confusion.
LSD flashbacks may be short in terms of duration, but may occur over and over again.
Contrary to popular belief that marijuana is not addictive, long-term marijuana users will typically experience withdrawal when they stop using the drug.