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Heroin Users, Smokers Share Some Similar Brain Chemistry

When non-smokers describe the effect smoking has on their friends and family, typically they use words like "unhealthy" and "addiction." Little did they know how right they are... Based on a comparison of brain scans, researchers found smoking produces major changes in the flow of "feel good" chemicals between brain cells, both temporarily and long-term. The human brain's natural system of chemicals, called endogenous opioids, play a role in dampening painful sensations, heightening...

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