I could almost feel the tiny molecules of caffeine spreading through my body, fanning out along the arterial pathways, sliding effortlessly through the walls of my cells, slipping across the blood-brain barrier to take up stations in my adenosine receptors. “Well-being” was the term that best described the first feeling I registered, and this built and spread and coalesced until I decided “euphoria” was warranted. And yet there was none of the perceptual distortion that I associate with most other psychoactive drugs; my consciousness felt perfectly transparent, as if I were intoxicated on
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