Psychoactive drugs are a type of drug that contains chemical substances that alter mood and behavior. Examples of psychoactive drugs include both legal and illegal substances. The legal drugs include caffeine, alcohol, and nicotine, while the illegal include amphetamines, cannabis, cocaine, and opiates. As a person who is addicted to coffee, I truly understand the addiction to caffeine. Caffeine is the most widely used stimulant in the world, in which it enables one to feel alert and energetic. It is found most commonly in coffee, sodas, energy drinks, and chocolate. Caffeine is a naturally occurring compound found in plant species, most commonly in the tropic and sub-tropic regions of the world. When one obtains caffeine, it is metabolized by the liver and broken down into three substances known as theophylline, theobromine, and paraxanthine. It stays in the human body for quite some time. There are quite some positive effects of caffeine which include, alertness, pain relief, endurance, productivity, and helps with neurological conditions. While there are many positive effects, there are also negative. The negative include insomnia, jitters, addiction, withdrawal headaches, increased blood pressure, and anxiety.