It is so interesting to me that caffeine is technically a drug. I was unaware that caffeine could be classified as a drug. In the slides, it says that caffeine is a psychoactive stimulant. I knew that caffeine had an effect on the mind and body, but I didn't know why. This makes me wonder if this is the reason that people feel like they need caffeine and when they don't have it they go through caffeine withdrawal. It is also known that there can be a tolerance to caffeine and then you need more and more each time to have an effect. After viewing these slides I understand that the reason the body builds up a tolerance and goes through withdrawal is because caffeine is a drug. These slides helped me to recognize the serious effects that caffeine can have on the body.