>>13972593My brother (law student) had a few friends over, and we were all smokeing weed together, Some hippy girl, a friend of his girlfriend said we could live forever if we ate a good enough diet and avoided all toxins.
Without being a dick, or too technical, i explained some of the mechanisms of ageing. She understood, and mostly accepted it.
Being a dick about people not understanding a thing never helps. Being friendly and casual can really be effective. Don't talk down to people, just talk to people.