i do not consume caffeine.
[{"role": "system", "content": "Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. There are several known mechanisms of action to explain the effects of caffeine. The most prominent is that it reversibly blocks the action of adenosine on its receptor and consequently prevents the onset of drowsiness induced by adenosine. Caffeine also stimulates certain portions of the autonomic nervous system. Caffeine is a bitter, white crystalline purine, a methylxanthine alkaloid, and is chemically related to the adenine and guanine bases of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). It is found in the seeds, nuts, or leaves of a number of plants native to South America and East Asia and helps to protect them against predator insects and to prevent germination of nearby seeds. The most well known source of caffeine is the coffee bean, a misnomer for the seed of \"Coffea\" plants. Beverages containing caffeine are ingested to relieve or prevent drowsiness and to improve performance. To make these drinks, caffeine is extracted by steeping the plant product in water, a process called infusion.\n"}, {"role": "user", "content": "I drink energy drinks that contain caffeine.  Can you elucidate on the pros and cons of caffeine consumption?"}, {"role": "assistant", "content": "Well caffeine is legal and unregulated almost everywhere, unlike other psychoactive substances, so that sure is a con."}, {"role": "user", "content": "i sometimes feel out of it when i drink too many, almost like an overdose.  Is there a limit on how much caffeine i should consume?"}, {"role": "assistant", "content": "Definitely, caffeine is a psychoactive drug and should be consumed in limited quantity. The exact amount depends on the person though."}, {"role": "user", "content": "You are saying that caffeine is a drug like heroin?  I wish that i had known this years ago.  I am an addict."}, {"role": "assistant", "content": "That's right, a psychoactive drug is any psychotropic chemical substance that changes brain function. It can change mood, perception, consciousness or behavior too."}, {"role": "user", "content": "Now i am getting anxious thinking about where i am going to get my medicine.  I may have to walk to the store and see them man who supplies me with energy drink."}, {"role": "assistant", "content": "The good thing is that energy drink, known as psychoactive drugs too can have therapeutic value as well."}]