Addiction
However hallucinogens generally are not seen as being addictive. They are actually very easy to get addicted to. This is because when the user takes hallucinogens, they escape reality. They get addicted to the feeling of forgetting their worries, and returning to their drug world. This causes the body to start needing this, and the body will actually go through withdrawal effects. Tolerance is built very easily with hallucinogens. Tolerance is when a user uses the drugs consistently, and their body gets used to the drug, so the effects are not as apparent. Therefore, the user has to up the dose continually to get the desired effect. For many hallucinogens, like PCP and MDMA, this is very dangerous, and could lead to stroke, heart attack, and death, as well as many other harmful effects.
Physical addiction could usually does not occur, but could easily occur with some hallucinogens. For example, PCP can be very addictive. Psychological addiction occurs with this classification of drug, however