I don't get the caffeine thing, never did.
I'm always switching between like 7 coffees a day for months, then a few months of no coffee. And I always feel better during the periods that I'm not drinking it, but I just like the taste.
Biggest difference is my level of interaction with the toilet lol.
I do have a past with heavier substances so that might have made me kinda immune to weak shit like caffeine.