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Ad lib caffeine consumption, symptoms of caffeinism, and academic performance.
Caffeine isn't harmful in moderate amounts but if you take more than around 300mg a day (four cups of instant coffee or two cans of Monster) you can develop caffeinism, a tolerance and addiction to caffeine.
I have studied my symptoms in retrospect, and noticed that the pharmacodynamic effects of caffeine and symptoms created by caffeinism have together masked the symptoms creating panic disorder.
Caffeinism can occur if you have above 600mg to 750mg of caffeine per day.