Alcohol & Substance Abuse · Lesson 3 · ~4 min
Lesson 1 promised an explanation for why "just stop" is so much harder than it sounds. Here it is. Addiction changes the actual machinery of the brain — and once you see how, the whole thing makes more sense, and less shame.
Deep in the brain sits the reward pathway. When you do something that helps you survive — eat when hungry, connect with people — it releases a chemical called dopamine. Dopamine is the brain's way of saying: "that mattered — remember it, do it again."1
Alcohol and other drugs hijack this system, releasing far more dopamine than any natural reward ever would — a flood, not a trickle.1 The brain takes note in the strongest possible terms: this, above everything else, is worth repeating. That's the hook.
Flooded over and over, the brain protects itself: it turns down its own dopamine system.1 Two things follow, and they're the core of the problem:
Just behind your forehead is the prefrontal cortex — the part that plans, judges risk, and says "not now." Sustained substance use weakens it, right as the reward pathway is screaming louder.1 Strong gas pedal, weak brakes. That imbalance is why willpower alone so often loses — and why it is not a fair measure of a person's character.
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