When a LSD user experiences a "flashback", visual or emotional experiences that were originally experienced while high on LSD are re-experienced.
Methamphetamine addicted individuals are at risk of high blood pressure, irregular heartbeat, chest pain, shortness of breath, nausea, vomiting, diarrhea, and elevated body temperature which puts them at risk of serious health consequences and even death.
Nearly 14 million persons are affected by alcoholism in the U.S. alone, not including family, friends and others additionally affected by the actions of alcoholics.
PCP was first administered as an IV anesthetic during medical procedures, but was never approved for human use because of problems during clinical studies, including intensely negative psychological effects.