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Examples of stimulants include caffeine, cocaine, and amphetamines. These drugs turn on the flight response of the sympathetic nervous system; this makes sense as coffee is typically used to wake people up and make them more alert. One may notice that when they get nervous their stomach hurts. This is due to the effect on the digestive system that stimulants have. They turn off the sympathetic nervous system which can decrease appetite. These drugs are very addictive, and harmful drugs like cocaine can have detrimental effects on the brain. Some research has proven that one in five people who try cocaine become addicted to it. As for hallucinogens, these include examples of THC and LSD. These drugs typically distort perceptions and increase sensitivity to colors, sounds, tastes and smells. They can also evoke vivid images which is understood as the hallucinating aspect of the drug. They drugs can be used for medicinal reasons; for example, THC can aide chemotherapy patients in curbing nausea and increasing appetite. It can also aide in reducing chronic pain for patients which some health conditions. Some bad side effects of these drugs include a decrease in motor control, as well as a false sense of euphoria. This can make these drugs highly addictive as they help the body to relax. Additionally, research on hallucinogens has proven that THC can cause a decrease in fertility for men.