I constantly hear coffee drinkers say how much they drink with shame and that they should cut back. It's one of the most common things I hear when someone is talking about their coffee consumption.

Personally, I stopped drinking caffeine when I was around 19 after I figured out it was the source of my chronic headaches (from withdrawal). I had to talk my dad out of taking me to a neurologist at one point in high school. My quality of life went up significantly after cutting caffeine and going through the week-long headache.