Drugs are what we call external chemicals that alter your internal chemistry. There are plenty of not drug things that also alter your internal chemistry such as stress and a person’s specific phenotype. I have had chronic migraines since birth and i get visual effects that look like streaks of brightness and darkness throughout my vision. When i was in a much more stressful situation i would get dark spots in the corners of my vision and during the rare truly awful migraines my vision will warp and/or different spots will shrink down to points.
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