>>Have gone 12 days without a cup of coffee.
>>
>>Torture!!!
>
>I smoked for 3 or 4 years and quit. It wasn't very hard.
>
>I eliminated all caffeine just to see if I could do it a few years back. A solid week of lethargy and headaches ensued. Way harder than nicotine.

I did it probably 15 years ago now. I had read an article suggesting it helps some people who get "hay fever" in the spring. It worked for me.

I drink decaf coffee, so I still get some caffeine, but probably only 3% or so of what I used to get. I don't drink teas or sodas which are 2 other major sources.