What's something that's viewed as socially acceptable today that you think will become unacceptable 20 years from now?

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I was just thinking about it actually - I feel like it's going to be the sheer amount of caffeine we ingest, or caffeine at all.
- Doubtful. Coffee, tea and caffeine in general have health benefits when consumed in not extreme dosages.
  
  And further, have all been culturally significant for many, many centuries now. Surely will not be abandoned in just a few years

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