Caffeine is the world's most widely consumed psychoactive drug (you can thank globalization and rough Monday mornings for that).

But before we had a Starbucks on every other block, the drink endured years of prohibition and reinstatements, picking up plenty of advocates and critics throughout its existence.

In his recently published book, Innovation and Its Enemies, Harvard University professor Calestous Juma highlights the some of the early difficulties that the drink faced when early coffee shops opened. Here are a few of them.