I would assume that there are too many variables in this measurement to make it useful. Things such as tightness or compression of the sample, cut of tobacco, amount in contact with instrument, and what is holding the tobacco and its electric conductivity (probably your hand), and conductivity of any casings or additives.
Have you been able to get reliable and reproducible readings? Are you able to actually use the readings to perform any quality control of tobacco moisture content practically? Have you tried to test the instruments accuracy in any way? (perhaps use a moisture pack in the tobacco that has a known humidity, or put tobacco in a humidifier with an accurate hygrometer)
Thanks for posting, this is an interesting concept but I remain a skeptic.