Nevertheless I would say the baking soda idea is a good one it is good for absorbing smell/odor.
I would say leave it in a seeled container thats obviously big enough to contain the camera and I suppose at LEAST 500g baking soda in a bowl...
Befor doing this I would suggest you could wipe the camera with a clean but dampened cloth- taking care not to get too much dampness on the buttons etc, the D7000 IS SUPPOSED to be quite "well sealed", but I know it obviously isnt water proof or even water tight. I have got my D7000 quite wet in the rain and it went into error and shut down untill it had time to dry an everything it back to normal. So its not very splash proof either. But once you feel its been cleaned you could try wiping it with PTFE lube or silicone thats been sprayed onto a cloth. Again take care not to get too much on. This would also help expell the ODOR, I would say even the odor of PTFE lupe is better than the smell of cigarette fingers .
Maybe somebdoy has comments on the use of PTFE lube or silicone on Nikon Rubber? But I am sure a bit will be ok as a suggestion.