The tin note is bitter chocolate with tobacco. When taken, the tobacco comes to the front, and the chocolate note recedes -- it's not like some of the other chocolates where it's like you snorted Nestle's Quik or something.
I'm not getting any specific tobacco type -- maybe some of you with deeper pipe palates will be able to pick out Virginia or Perique -- it's too subtle for me. I don't find it particularly fruity except for maybe a tiny hint of chili -- if you've ever made Alton Brown's hot chocolate recipe, this is very close, if he included tobacco...
Supposedly the Punjabi Rustica gives it a nicotine kick, but I'm not getting anything like that after doing it three times in the last 15 minutes while I write this.
I'm giving it four of five stars. If I ever work through all the other chocolates I have, this would be my choice to re-up.