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How Smoking Affects the Brain PharmEasy When you inhale a cigarette, thousands of toxic chemicals enter your body, triggering immediate reactions in your brain and respiratory system. Nicotine reaches the brain in under 10 seconds, Chronic nicotine increases midbrain dopamine neuron activity and biases individual strategies towards reduced exploration in mice Nature Communications Puffing away sadness Harvard Health Understanding how habits work, especially with smoking, requires looking at the brain's reward system and how it forms automatic behaviors. At the heart of this process is dopamine, a neurotransmitter responsible for Nicotine addiction can become a cycle of dopamine release, withdrawal, and cravings that reinforces continued nicotine use. The tobacco industry profits from keeping this cycle going. What feels like relief is often

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