Which stimulant is commonly known for its widespread use in beverages?

Caffeine is widely recognized for its prevalent use in beverages such as coffee, tea, and soft drinks. It serves as a central nervous system stimulant, enhancing alertness and reducing the perception of fatigue. Its popularity in various drinks is due to its ability to increase concentration and improve mood temporarily, making it a staple in many people's daily routines. Products containing caffeine are accessible and socially accepted, which contributes significantly to its widespread consumption.

While cocaine is a powerful stimulant, its use is restricted and illegal in many places, and it is not typically found in beverages. Nicotine, primarily associated with tobacco products, is not commonly found in beverages, although some nicotine-infused drinks exist. MDMA, known as ecstasy, is a synthetic drug primarily associated with recreational use in party settings and is not used in beverages. Thus, caffeine is the clear choice as the stimulant commonly consumed in beverages.