- "People drank alcohol because it was safer than water". If you want safe water, all you have to do is boil it. A lot simpler than beer brewing.
- "People became smarter after the Englightenment and started drinking coffee instead of alcohol". How about drinking coffee in addition to alcohol? The coffee houses developed in parallel with the beer houses, not instead of them. We recently had an article on HN that made the point that alcohol consumption actually increased in the 19th century.
- "Adam Smith was so smart because he drank coffee". He also drank lots of wine - preferably Bordeaux (or claret, as they called it in Scotland). Some of the most bitter passages in Wealth of Nations are directed against the British government using taxation to promote port wine (Portugal was a British ally) over claret (France was usually an enemy).