...yeah, I think most tobo was sun-cured/air-cured back then?
This page has some interesting data:
http://www.longwood.edu/staff/hardinds/tobacco/maps_and_graphs.htm
...and includes this bit:
Sun-cured tobacco may be the least important today, but it once ruled the Virginia economy. Sun-cured tobacco is a dark air-cured variety that I believe is the descendant of the tobacco known as "sweet-scented" during the colonial period...What makes sun-cured tobacco a likely candidate as heir to the sweet-scented legacy? First, it is a dark tobacco, just like sweet-scented. Second, it is cured in the same manner as sweet-scented was during the colonial period: by cutting the whole stalk, setting the cut plants out to dry in the sun, and by hanging the entire plant for air-curing. Third, it still is prized as a pipe tobacco in Europe. It is a shame that it is nearly extinct.
This pdf explains well how fire-curing came to be (due to damp conditions) and how eventually this led to the more controlled method of flue-curing...
http://legacy.library.ucsf.edu/documentStore/g/k/c/gkc79h00/Sgkc79h00.pdf