Nicotine is a naturally occurring alkaloid found in the tobacco plant. It is primarily known for its stimulating effects on the central nervous system, which can lead to addiction. When consumed, nicotine quickly reaches the brain, where it enhances mood and concentration, making it a key component in many smoking and vaping products. Despite its stimulating properties, nicotine is also associated with various health risks, particularly when delivered through traditional tobacco products. Long-term use can lead to dependence and is often linked to serious health issues, including heart disease and lung cancer. Understanding nicotine's effects is crucial for those considering its use.