The immediate effects of caffeine consumption vary from person to person, depending on individual factors. Most adults can tolerate 2 cups of caffeine-containing liquid a day, but children should avoid caffeine, which is present in many carbonated soft drinks. Increased urine output. Some people believe caffeine consumption relieves fatigue, but this is an artificial effect. Use of caffeine does not result in increased athletic performance.
Cocaine is illegal and addicting.
An overdose of cocaine can be fatal. Its damaging effects on the central nervous system increase greatly when it is taken with other stimulants such as amphetamines, appetite suppressants, or caffeine. Medical experts have documented no benefits from the use of cocaine among athletes. This is the addicting factor in tobacco smoke that makes smoking cessation so difficult for many persons. Nicotine causes constriction of peripheral blood vessels.