I'm still pretty new, but I've yet to find a juice that a hot rinse, dry burn, hot rinse doesn't take care of.  Even for the tanks and glass a good 30 seconds under the hot tap a couple of times gets rid of everything.  It's worked on coffee flavors and black licorice...never tried on a cinnamon, but doubt I'll ever buy a cinnamon flavor... 
  
Can't imagine what your doing is bad for you, considering the rinse and length of dry time you describe.