If it is for physical reasons that you quit caffeine, then I understand you can't really go back. Out of the three you quit, the hydrocodone
and smokes, you want to leave alone. You have done better than you can even imagine, and I mean that. You don't want to go back, however, with the caffeine, you might want to consider breaking just a tad. When I say that, I mean things like tea, soda, chocolate, not something like coffee and or energy drinks/shots.