Tea is an alcoholic beverage that contains purine alkaloids namely caffeine, theophyline and theobromine that stimulates the CNS. Among the three caffeine is the most addictive alkaloid since it antagonizes adenosine receptors causing dependance. In some individuals there is a hypersensitivity and withdrawal symptoms similar to nicotine in cigarettes. Try to cut back slowly and avoid other caffeinated drinks. Additionally, steep tea leaves and pour the liquor then prepare an infusion with the used tea leaves. Since alkaloids are polar, a significant amount is lost in the process. I am working on tea in my PhD studies.
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