Probably a lot more work related murders.

Tea

Offices won't get any work done before 10am. Soldiers would fall asleep at their posts.

Cartels would become huuuuuge (more hugerest than now) also fast car and fast boats sales would skyrocket.

Personally I would pass away and die.

I'd probably die.

That day I will definitely not being in the office. I mean... It's gonna be a wreckfest.

Revolution

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!

The software industry would stall out, mass unemployment, dramatically more car crashes. Coffee, black and green tea, most soda, and some drugs would disappear from shelves and stores. Coffee shops would all close, you'd be able to get pretty much just water with your big Mac, midol takers would be furious and in pain, ADHD people would have to try harder to fall asleep. For lack of a better term, there would be a rubber band effect apocalypse while the shadow markets got set up and supplies

riots

Take away my morning coffee, and you’ll have me becoming a super villain taking over the world.

Just a reminder that a substance being legal doesn't mean you should consume it.

It would be yet another failed policy pushed by the kind of idiots who like to ban things. Comics/Guns/Porn/Drugs etc.