Wow, what a bunch of Germaphobes. I've shared joints with homeless people. I pick up hitchhikers, some of whom have questionable hygiene. I probably get dirtier on your average day of rock climbing or hiking then a homeless person in the city does. I also never get sick. You need some exposure to germs to stay healthy. It also sounds stressful to be so worried about hygiene that you won't shake hands with a dirty person. That's crazy.
https://en.wikipedia.org/wiki/Hygiene_hypothesis
https://en.wikipedia.org/wiki/Hygiene_hypothesis
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