Caffeine must be one of, if not the, most used drug. It is vital to the operation of more or less every industry.
Tea
There’d be a lot more bloodshed on Monday mornings
Well, without caffeine i would turn into an ax wielding murderous psychopath. Humanity would seize to exist, nature would heal and the world would rebuild itself. Lizards would become the dominant species and tadaaaa!
People would suddenly realize it’s better to go to bed earlier and sleep longer than hitting snooze 5 times and needing that energy boost every morning. Who am I kidding, people would revolt.
I think productivity would increase after about a month of global caffeine withdrawal. Plus heart attacks would probably decrease