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How Smoking Affects Your Brain Health Henry Ford Health Detroit, MI What Happens When You Smoke? Cigarettes contain nicotine, tar, and carbon monoxide. Short term effects: Increased heart rate Higher blood pressure Reduced oxygen Long term effects: Lung cancer 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 Cigarette smoking and thinning of the brain's cortex PMC Chemicals in Tobacco Products and Your Health StoryMD

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