1. Stimulants/Uppers. These will work on your nervous system when you consume drugs like cocaine, amphetamines, ephedrine, or MDMA. You will feel powerful, have better concentration, and have a more robust metabolic rate. But, the pleasure doesn't last long. Continuous abuse leads to shortness of breath, stroke, palpitation, and anxiety. You may also become more susceptible to a heat stroke from poor thermoregulation.2. Narcotics. Heroin, morphine, and codeine are all narcotics. These highly addictive drugs make you feel euphoric and give you an increased threshold to pain. Injecting these drugs make you feel relaxed, gives you hallucinations, and makes you more optimistic about life. However, once you stop, you will experience intense drowsiness, have collapsed veins from overuse, frequent nausea, and lack of coordination.3. Psychedelics. These drugs are also known as hallucinogens, which change how you perceive the world, shift your mood, and slow down cognitive processes. You may start seeing and hearing things that don't exist. The heightened confidence, happiness, and even amplified senses may make you impulsive. Psychedelics like LSD and Psilocybin (magic mushrooms) make you feel invincible. Once the effect wears off, you experience a substantial loss of appetite, numbness, dizziness, and intense sweating. In extreme cases, you may even feel paranoid.4. Dissociative. Taking Dissociative drugs causes an influx of dopamine to rush through you, making you feel high. The environment around you starts fading, and you become hyper-focused on chasing the high. There is also a chance you may become aggressive and pick fights.