Is tea harmful or good for health?

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Dear friends, I don,t like tea. Some times in winter i prefer to take tea but in summer days i don,t feel like taking tea and moreover i don,t like making tea. Some people take tea contineously . Does it make some harmful effect on them and does it really make them active. I am in research field . Our researches are mad after tea. Just after taking lunch they ask for tea. so how far this is OK?