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Exposure to a social stressor alters the structure of the intestinal microbiota: implications for stressor-induced immunomodulation

This could be down to any number of reasons

Thats going to be very exciting. E-cigarettes: Harm reduction or swapping addictions

The risk assessment details: location, topic being assessed, description and evidence of impacts and potential impacts, an assessment of the severity of risk, and recommendations for corrective action

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doi: 10.1046/j.1365-2036.1999.00630.x