Gambatte -
Active Marine here (11 years service, 14 years cancer-building). I'm quitting with you. Join the Roll Call today (September group), and we'll be in the same Hall of Fame.
I know how hard it is when everyone around you is an addict, and they're the special kind of assholes that love to sabotage a quitter. Been there, done that. You gotta be the one success story, to show them that there's a better way.
Lots of water and PT. I highly recommend hitting the weights, and putting that lowered metabolism to good use (like monster pecs and lats). By now, you've probably started experiencing the cold-like symptoms. Think of it as a hangover from nic, which is nature's way of telling you that you've been an idiot for several years. Then drink some more cold water (add lemon for variety), chew some gum, and hit the gym/track/pool/bike for a sweat sesh.
You're doing awesome, but you haven't completed the mission quite yet.