A Hallucination is an experience of something that is not present in reality. To hear sounds or voices that are not present is an example of an Auditory Hallucination. To see an imaginary person to smell something this is not really present are other examples of hallucinations.

Hallucinations may occur during intoxication with psychedelic drugs or during withdrawal from alcohol or benzodiazepine drugs.

Drugs which alter perception, thoughts and feelings are called Hallucinogens. They may produce hallucinations or illusions.

LSD, mescaline and psilocybin (magic mushrooms) are all examples of hallucinogens.

These drugs are also often referred to as Psychedelics.

The Harm Reduction approach to serious addiction suggests offers protection from the most serious consequences of addictive behavior.

Providing clean needles to intravenous drug users is an example of harm reduction that aims to avoid the spread of Hepatitis C and AIDS.

Heroin is a highly potent and highly addictive opiate drug.

Addiction and Physical Dependence may rapidly occur with use of heroin.