Caffeine or Nicotine is a term used to describe two of the most commonly used stimulants in the world. Caffeine is a naturally occurring stimulant found in coffee, tea, and chocolate, while nicotine is a stimulant found in tobacco products. Both substances are widely used and have been linked to various health risks. Caffeine is known to increase alertness and energy levels, while nicotine has been linked to increased risk of cancer and other diseases.