Hallucinogens are drugs known to cause hallucinations. These are distortions of a person's sense of reality. When a person suffers from it, they may see images, hear and experience sensations that they think are real but which in reality do not exist. These types of drugs can also cause mood swings. A person's heart rate and blood pressure may increase, and a person may even have convulsions or seizures if these drugs are used in high doses. The effect of these drugs can vary between users and its effects depend on the amount taken, their mood and whether the drug is combined with another drug or alcohol. Hallucinogens have been around for thousands of years. Some cultures even use plants to counteract these states of confusion and detach a person from reality. The plants contain a chemical compound similar to serotonin and the effects produced disrupt the normal functioning of the brain system. The most common hallucinogen is LSD. This is a synthetic compound that is produced everywhere. Other hallucinogens include MDMA, PCP, ketamine and DXM. These can mimic neurotransnicptera...