Take a quick look at the following post:
FCV production and curing
The important thing is to get the curing right first - any further ageing, maturing will ultimately depend on the quality of the original cure.
This section is the important bit:
"The purpose of curing:
Tobacco leaves are...
Nicotiana Rustica has the highest natural nicotine, but this is rarely, if ever, used in pipe tobacco blending. In fact these days it is mainly used as the source for nicotine used in electronic cigs etc.
There is a bit more info in this post...
Glad you enjoyed it. I still work in the industry and loving it :)
I hope you saw some of the other ones I wrote?
Just pondering what to write about now ....