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I started drinking green tea and black tea in the morning in high school. Then I ran out. Cue a few days of headaches, bad moods, falling asleep and cold-like symptoms.

Then a few years later I started drinking coffee regularly. Same thing happened when I quit.

Now, I drink green tea in the mornings occasionally and have had no problems with stopping.

If you don't have a need consume caffeine, don't start. It seems to follow the tolerance/withdrawal pattern at even small doses.