I'm surprised that people don't know that caffeine is addictive. I'd think most adults have accidentally withdrawn from it at some point.

I just tapered over the last two weeks, easier as an iced tea drinker. I measured what I drank one day in grams and then had 10% less the next day, decreasing by the same mass for the next 10 days. No side effects at all and it's there if I want to go back.