I wonder if environmentally ambient RNA could impact gene expression in humans. RNA directly impacts gene expression: https://www.ncbi.nlm.nih.gov/pmc/articles/

I wonder if environmentally ambient RNA could impact gene expression in humans. RNA directly impacts gene expression: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2612776/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2612776/ Say we swap some bacteria by using the same public restroom paper towel dispenser. Your bacteria happens to carry some tragic memory of stress encoded into some miRNA that formed when traveling to somewhere with very cold temperatures. Certainly gene expression wouldn't be affected by a small bacteria colony, but maybe if there was repeated exposure, every day in the same place or with the same people, would I think twice about visiting Alaska? I have observed how places like cities tend to affect people's 'look' in semi-coordinated ways. How spending sustained time with a group of friends really does change a person in subtle ways. Is there any way that ambient miRNA could be a part of that process? Is there a way we can be sure that it isn't a factor?