Dr. Guavita asked fifty smokers a series of questions about their childhoods and then collected blood samples from them. He found a high correlation between levels of the stress hormone cortisol and amount of reported childhood trauma. Dr. Guavita's research shows that childhood trauma

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The research shows a correlation, not causation, between childhood trauma and cortisol levels, suggesting a possible relationship with stress levels in adults.

Dr Guavita Asked Fifty Smokers a Series of Questions About