Caffeine

C₈H₁₀N₄O₂

Caffeine is the most popular drug in the world. Millions of people consume it every day in drinks such as coffee, tea, energy drinks, and soda. It is a stimulant that affects the central nervous system and helps people feel more awake and alert. Many people use caffeine in the morning to start their day or when they feel tired. It can improve concentration and reduce fatigue for a short period of time. However, too much caffeine can cause problems such as anxiety, trouble sleeping, and a fast heartbeat. Even though caffeine is widely accepted and legal in most countries, it is still a powerful substance that should be consumed in moderation. Because of its popularity and daily use around the world, caffeine is often called the most popular drug in the world.