What do you mean, quit caffeine?
Kendra Vaculin, writing for the New York Times in There’s Never Been a Better Time to Quit Caffeine - The New York Times:
the culture has shifted. A renewed focus on health has inspired many people to examine their relationship with coffee and, more specifically, caffeine, mirroring changes in alcohol consumption.
It's happening. The Overton window is shifting to open up for discussions about the potential negative side-effects of caffeine and, in particular, caffeine addiction.