Nicotine withdrawal (even if it's not complete withdrawal) can probably produce these symptoms. Nicotine helps concentration, and can be a stimulant, so withdrawal can have a negative impact on concentration, and make you tired.
I'm not a fan of energy drinks. The taste doesn't seem all that great, and who really needs all that caffeine anyway. If I want caffeine, I'll just have coffee or Mountain Dew. I know, because Mountain Dew is so much better for you than energy drinks...![]()





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