In normal adult humans, alertness, decreased fatigue, improved ability to concentrate, and elevated mood are likely to be observed following administration of low doses of

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All of these substances, amphetamine, cocaine, and nicotine, at low doses, can lead to increased alertness, decreased fatigue, improved ability to concentrate, and elevated mood in normal adult humans due to their stimulant effects on the central nervous system.

In Normal Adult Humans, Alertness, Decreased Fatigue, Improved Ability to Concentrate