LSD is a powerful hallucinogen that has been can alter an user's mood, thoughts, and perceptions.
Use of amphetamines can cause an individual to become psychologically dependent on to them so that they are so central to a person's thoughts, emotions, and activities that the need to continue their use becomes a craving or compulsion.
PCP causes hallucinations, which are profound distortions in a person's perception of reality.
The onset of alcohol withdrawal symptoms most often occurs within 5 - 10 hours after the last alcoholic beverage is consumed, but can sometimes begin days later.