Drug injection taking drugs, injection is favoured by some people as the full effects of the drug are experienced very quickly, typically in five to ten seconds. It also bypasses first-pass metabolism in the liver, resulting in higher bioavailability and efficiency for many drugs (such as morphine or diacetylmorphine/heroin; roughly two-thirds of which is destroyed in the liver when consumed orally) than oral ingestion would. The effect is that the person gets a stronger (yet shorter-acting) effect from the same amount of the drug. Drug injection is therefore often related to substance dependence. In a recreational context, the shorter, more intense "high"
Drug user Drug user The term drug user is often used to refer to a person who consumes an illegal psychoactive substance. The term "user" is typically employed to refer to someone who is a drug user, abuser, or addict. Drug users are sometimes referred to as "heads", depending on the drug used, i.e., pothead, hophead, crackhead, etc. People have used drugs for thousands of years. Evidence of human use of opium has been found in neolithic and Bronze Age archeological sites in Europe, and an opium pipe from 1,200 years ago has been unearthed on the island of Cyprus. The psychoactive