PCP use may alter mood states in an unpredictable fashion, causing some individuals to become detached, and others to become animated.
Sixty-one percent of American college students with ADHD report diverting their prescriptions including Adderall, Ritalin and Concerta to someone else.
Some LSD users report developing a tolerance to the drug's effects, meaning repeated doses no longer have the same effect.
Statistics indicate that anywhere from 125 and 203 million people worldwide have used marijuana at least once in the past year.