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In the short term the symptoms are headache, fatigue, anxiety, irritability, depressed mood, and difficulty concentrating. That generally lasts less than a week, but can be very difficult for heavy users.

However, because of how it integrates with your sleep patterns it can take 6 months for normal alertness levels to show up assuming total avoidance. Healthy individuals with reasonable sleep cycles should feel alert for the vast majority of the day without any form of stimulants.