Final answer:
Caffeine can lead to panic attacks, anxiety, and other health issues when consumed in high quantities but can also improve concentration and athletic performance in moderation.
Step-by-step explanation:
Adverse experiences that can result from caffeine consumption include panic attacks and anxiety. These effects are due to caffeine acting as a central nervous system stimulant, which can lead to symptoms such as insomnia, agitation, muscle twitching, nausea, and irregular heartbeat. Consumption of caffeine in large amounts can exacerbate mood disorders, contribute to substance dependence, and pose risks for cardiovascular disease and diabetes. On the other hand, moderate caffeine use is associated with positive outcomes such as improved concentration and enhanced athletic performance.